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Equipment Discussions >> Mounts

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SunBlack
scholastic sledgehammer


Reged: 05/05/11

Loc: Rome (IT)
Celestron VX mount: experiences and problems
      #6053771 - 08/30/13 03:28 AM

See at http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/5613234/page... for my first doubts and problems.

So:
1) the RA clutch lever doesnt secure properly the RA axis: even if i tighten the bolt, the RA axis turns (if i put a bit of pressure by hand). How to fix?

First night negative.
I just went with AP setup (canon 5d+300mm), unguided for 2 minutes at celestial equator. No ASPA, nor calibrating stars, tried to use the polar scope only, setting it on (roughly since no hour rings on mount) to what Polar Finder software indicates about Polaris position. Probably this inaccurancy led to trailed stars. (Used 1 star alignment. Goto was pretty accurate. )

Tomorrow, if no clouds, i would try again with polar scope, at about 11pm LT, when i saw on Polar Finder, Polaris will be a 9 hour Clock.

2) Skymap has the Ha Polaris data, how to calculate the Polaris Clock data? (i installed Cartes du Ciel but it gives me only Ha Polaris data too)


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cn register 5
scholastic sledgehammer


Reged: 12/26/12

Re: Celestron VX mount: experiences and problems new [Re: SunBlack]
      #6053833 - 08/30/13 05:06 AM

1) Balance the scope.

2) Use ASPA

Chris


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SunBlack
scholastic sledgehammer


Reged: 05/05/11

Loc: Rome (IT)
Re: Celestron VX mount: experiences and problems new [Re: cn register 5]
      #6053848 - 08/30/13 05:21 AM

If i'd use the ASPA: consider that on my home backyard i have limited portion of sky.
I see north, (little) north east and north west, no west, no est, South and south west (limited to 30° alt).
So in these conditions, could i try and succeed with ASPA?
In these conditions, how to choose right 2+4 stars?


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cn register 5
scholastic sledgehammer


Reged: 12/26/12

Re: Celestron VX mount: experiences and problems new [Re: SunBlack]
      #6053896 - 08/30/13 07:14 AM

South is fine for ASPA.

If you look at the sky you can see which bright stars are visible to you. A planisphere can help with identifying them, or there are smart phone apps.

Choose those for the align stars and the first calib star, it will be easier to be sure that you have the right one. After the first calib star the pointing should be good enough that later stars are in the EP. If the scope isn't looking at the sky then try a different star.

I think you may be over analysing this, it's worth practicing with the mount and HC indoors to become familiar with how it works but really just get outside and have a go.

Or get StarSense. I've been beta testing it in a more obstructed location than you describe and it was fine.

Chris


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SunBlack
scholastic sledgehammer


Reged: 05/05/11

Loc: Rome (IT)
Re: Celestron VX mount: experiences and problems new [Re: cn register 5]
      #6054706 - 08/30/13 04:15 PM

Real-time: how to change long and lat coordinates instead of preset cities? I goto to view time-site menu, go to cordinates but cant change anything.....

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cn register 5
scholastic sledgehammer


Reged: 12/26/12

Re: Celestron VX mount: experiences and problems new [Re: SunBlack]
      #6054794 - 08/30/13 05:16 PM

press undo when you get to the time prompt, this gets to the setting latitude and longitude pages.

Chris


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SunBlack
scholastic sledgehammer


Reged: 05/05/11

Loc: Rome (IT)
Re: Celestron VX mount: experiences and problems new [Re: cn register 5]
      #6055537 - 08/31/13 05:11 AM

Second night: success (partial, according my standards).
No way to have a good tracking with polar scope.
So i went for a 2+4 than ASPA. A long procedure i'd say.....since even with Skymap software is difficult/long to understand where is located the named star indicated in the HC. Then, i tried one PEC session via HC.....better tracking but no so much. Finally i tried a sequence of 5 PECs by PC, and results are in line with what i obtained with my ex Vixen GPDX.
I think that if my accurancy in guiding during PEC sessions will be improved (i remember i dont use autoguide and so my guide is manual), taking more care about what keys i'd press if the guiding star move i.e. left or right in respect of eyepiece reticle, i could obtain even better results.

Results:

No pec, 10 exposures

2 extra trailed
3 medium trailed
1 low trailed
4 good
-------------
1 pec, 10 exposures

3 extra trailed
2 medium trailed
2 low trailed
3 good
--------------
5 pec, 6 exposures
(2min at 300mm FL + Canon 5D)
6 good
--------------
5 pec, 4 exposures
(2min 15s at 300mm FL + Canon 5D)
2 low trailed
2 good



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SunBlack
scholastic sledgehammer


Reged: 05/05/11

Loc: Rome (IT)
Re: Celestron VX mount: experiences and problems new [Re: SunBlack]
      #6058647 - 09/02/13 02:50 AM

Last night new sequence of PEC (this time 4 iterations) with (previous) best-aligned polar witnessed (used eyepiece illuminated reticle)
4 pec, 4 exposures (2min 15s + Canon 5D at 300mm FL)
4 good


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SunBlack
scholastic sledgehammer


Reged: 05/05/11

Loc: Rome (IT)
Re: Celestron VX mount: experiences and problems new [Re: SunBlack]
      #6058715 - 09/02/13 05:33 AM

Some questions now:
1) What could be reason i had to correct frequently on DEC? ASPA inaccurate?
2) My Firmware versions are: HC: 5.22.3141 MC: 7.08.3071, should i upgrade something?
3) On Aligning and GOTOing, there's a feature that after pointing a star west to meridian, on going to a second star at east of meridian, i can avoid that the mount twists on itself, and goes to second star passing in front the meridian, doing "less road"? (my english is bad, i know)


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Dr.Don
member


Reged: 05/31/13

Loc: Northern California
Re: Celestron VX mount: experiences and problems new [Re: SunBlack]
      #6064395 - 09/05/13 12:54 PM

I bought my AVX 3 weeks ago and have had nothing but problems with it.

I set the index marks and have manually polar aligned using the bore hole or polar scope over several nights.
I balance the scope although both axes seem stiff. The mount almost always finds the first star (Arcturus) and sometimes the second star (Vega). Even if it finds Arcturus and Vega, it sometimes cant find its way back to Arcturus. It has never found a calibration star (Altair), missing by 5-15 degrees.
It won't consistently find Arcturus and sometimes misses the second alignment star by 5-10 degrees.

The RA motor sounds fine.
During a large slew the dec motor is OK at first but then starts a slow decrease in RPM's over a few seconds. It sounds like what you expect if a battery was running down but I power it from a 15 Amp supply.
The right arrow button sometimes moves the scope smoothly but other times it doesnt move at all. I can hold the arrow key down or give it several pushes. After several seconds the mount will make a quick jump like it was in high speed slew mode and sometimes put the object out of the EP.
The other 3 buttons always work.
Factory reset did not solve the problems.
At least the RTC keeps the correct info.

If it were not for the problem with the right arrow I could be convinced I'm not doing the alignment correctly.

The Orion store is 10 minutes from my office. The mount goes there today.

Don


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rmollise
Postmaster
*****

Reged: 07/06/07

Re: Celestron VX mount: experiences and problems new [Re: Dr.Don]
      #6064461 - 09/05/13 01:32 PM

1. Always use a fully charged 12-vdc battery or Celestron's 5-amp AC supply.

2. Don't worry about it "finding" stars, don't worry about how far away they are from where the scope stops. Just center them up after it stops.

3. Make sure you center the correct stars. "Almost" ain't good enough.

4. Don't obsess over the axes being "too stiff." That won't affect go-tos at all.



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Dr.Don
member


Reged: 05/31/13

Loc: Northern California
Re: Celestron VX mount: experiences and problems new [Re: rmollise]
      #6064552 - 09/05/13 02:20 PM

I am using a high quality MFJ 15 Amp supply. There is no reason to change.
If it can go from Arcturus to Vega and then cant get back to Arcturus there is something wrong.

The dec motor issue is enough reason to return the mount for replacement. And I have another 8 days left in my 30 day money back guarantee so the whole C9.25 could find its way back.


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rmollise
Postmaster
*****

Reged: 07/06/07

Re: Celestron VX mount: experiences and problems new [Re: Dr.Don]
      #6064711 - 09/05/13 03:45 PM

Not "going back to Arcturus" would be expected if there is a problem with your alignment/procedure to begin with.

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Dr.Don
member


Reged: 05/31/13

Loc: Northern California
Re: Celestron VX mount: experiences and problems new [Re: rmollise]
      #6064806 - 09/05/13 04:38 PM

Alignment procedure:
1. Balance
2. Reasonably good polar alignment using the polar scope from my C8.
3. Set index marks.
4. Turn on, hit Align.
5. It usually get pretty close to Arcturus.
6. Use arrow keys to center in finder, hit Enter.
7. Use arrow keys to center in EP, hit Align.
8. Repeat with second star as selected by the HC.
9. See if it properly tracks the second star.
If it tracks the second star, select another object. One night it actually made it to M13 and another night to M57. But most times it couldn't find Altair, Alcor, or Arcturus.

If tracking or slewing fails, turn off power, go back to step 1 or 2 and repeat until frustrated. Then go into the house and let my son try it himself several times. Guess what? He gets the same results.

Since I am still within the 30 day window the very nice folks at Orion have ordered a new scope for me. I just have to pack up the whole telescope and bring it back to Orion.

Don


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rmollise
Postmaster
*****

Reged: 07/06/07

Re: Celestron VX mount: experiences and problems new [Re: Dr.Don]
      #6065027 - 09/05/13 07:03 PM

If you are not doing the calibration stars, your go-to accuracy will be limited.

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Stew57
Carpal Tunnel
*****

Reged: 05/03/09

Loc: Silsbee Texas
Re: Celestron VX mount: experiences and problems new [Re: rmollise]
      #6065158 - 09/05/13 08:32 PM

I don't know if you are doing this but always finish with up and right when aligning. Add at least 1 calibration star. GOTOs should be fine. I will say I had one CGEM that Celestron had me test over and over and finally replaced it because it just wouldn't point. The replacement is dead on!

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schluterdude
super member


Reged: 08/05/13

Loc: Centerville, OH
Re: Celestron VX mount: experiences and problems new [Re: Stew57]
      #6065215 - 09/05/13 09:15 PM

I never bother with hitting "enter" in the finder first. I get it centered in the eyepiece then hit enter the align. I also use all 4 calib star slots. Lethal accuracy.... I also use a 12mm EP during this on an 8" f6 reflector...

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Gary Minder
member


Reged: 06/23/13

Re: Celestron VX mount: experiences and problems new [Re: schluterdude]
      #6065236 - 09/05/13 09:30 PM

IMHO if someone isn't doing a careful 2+4 before deciding a mount can't accurately Go-To then getting another mount may not be any less frustrating.

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seawolfe
professor emeritus


Reged: 06/26/13

Loc: N 47.11.23 W 122.20.18
Re: Celestron VX mount: experiences and problems new [Re: Gary Minder]
      #6065608 - 09/06/13 05:36 AM

Agreed.

You HAVE to do a 2 + 4 and it's very plain on the handset that you press Enter after centering on the finder scope and then Align after centering in the EP.

Using a medium power EP or better yet, a illuminated reticle helps greatly in the EP alignment.

That said, I know from experience to have the scope well balanced, have the Rec and Dec locks ON... Have the correct latitude alignment. Have the correct time, day, time zone and type of time... i.e. DST vs. Standard time.

Next, first and second alignment stars will NOT be spot on, but you have to move the scope to it using the arrow keys. Use Up and Right to keep the backlash down.


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schluterdude
super member


Reged: 08/05/13

Loc: Centerville, OH
Re: Celestron VX mount: experiences and problems new [Re: seawolfe]
      #6065652 - 09/06/13 06:48 AM

Running the mount calibration/ra switch routine helps as well. And the "precise goto" function if you are strapping on accessories/running at the high end like I am... My OTA with rings/dovetail/camera tips the scales at 27 lbs... It's rated for 30, and I can hear the ap'ers groaning at the 50-75% rule!!!! Someday I'll get a monster ;-)

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MartinTreadgold
super member


Reged: 04/17/13

Loc: Netherlands
Re: Celestron VX mount: experiences and problems new [Re: schluterdude]
      #6065730 - 09/06/13 08:29 AM

Yes, one of my friends ask me what she should buy her boyfriend as a present, i suggested that he should take up astronomy, she thought it was a great idea, so she went out and bought him an AVX mount and C8 as a present, lucky guy..

But... he didn't like it because, he only wanted to look at the stars from his balcony, he lives in the worst light polluted places on earth, right next to a steel works in the Netherlands, he didn't want to travel out to friesland, or the dutch islands to get out of the light pollution, and, the balcony was not sturdy, so it vibrated and shakes every time a car drove past in the street, or when he walked about on the balcony, hence knocking it out of alignment. Because of the light pollution, he found it too difficult to align, you are lucky if you can even see vega. He didn't understand what a complex piece of scientific equipment it is, and that you have to really travel with it, and make an effort to use the thing properly

Now he has taken it back to the store to get a refund, the ungrateful muppet... I think she should dump him, take the scope off him, and date me instead lol.

Moral of the story, (which is true btw), the mount is only as good as the effort you put into aligning it.

My AVX has been fantastic so far, but the accuracy is only determined on how accurate you are in aligning it. Can't stress enough how important it is to centre those stars perfectly. I have yet to buy a reticle eyepiece, it is on my shopping list..

I do have the Skysync GPS, and that is a really useful thing to have, it improves the accuracy and saves a lot of time.

So Reticle Eyepiece, Skysync GPS, 2 star + 4 Calib stars and the ASPA routine should be good every time.

The thing is, if you read too much into the forums about the AVX.. you will see too many negative comments, as people only tend to post when things go wrong. You don't hear about the many thousands of people who have this mount and it works brilliantly. So don't read too much into the negative stuff.

It takes time and practice to get a mount to be accurate, don't expect to get it 100% on the first few goes, it is only as good as you are with it.

Practice Practice and Practice is all i can say

Best Regards

Martin


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Dr.Don
member


Reged: 05/31/13

Loc: Northern California
Re: Celestron VX mount: experiences and problems new [Re: schluterdude]
      #6066298 - 09/06/13 02:49 PM

This is a description of the problems I am having with a new C9.25/AVX.

First: I take time to balance the scope. I precisely follow the process in the manual. The appropriate clutches were released and engaged again as directed. I do a stationary balance first then push on the scope in both directions to see if it moves more easily and farther in either direction. I do this for both axes and several times. My C8 is much more sensitive to being out of balance. I have had it for 20 years, I know my way around the sky and I know what objects I'm looking at. The only time I manually move the scope is to align the index marks with the power off. I use a high quality 15 Amp power supply and I checked the voltage while running the scope. It's fine. I verified my location, local time, time zone, DST and offset from GMT are correct. I have done 2 factory resets. I do not have any accessories.

Second: The scope is level. I have done a visual polar alignment by putting the tripod down pointing roughly north, or looked through the bore hole, or used a polar scope. I have done all variations/combinations of these methods. As expected, there is no difference in how the scope behaves.

Third: I can use the HC to move the scope in all 4 directions very smoothly. Then it stops responding to the right arrow button. I can push it multiple times or hold it down. After 1-3 seconds it suddenly slews at high speed in that direction like I had done a GOTO. The slews used to be smaller but now many of the slews take the object out of the FOV. Then it will respond normally again. This happens intermittently several times a minute while observing any one star. I follow the up and right recommendation.

Fourth: I have used the scope about a dozen times and every night this exact problem happens several times and always to the right.

Fifth: Each night I have verified several times during a session that the balance doesnt need to be adjusted.

Sixth: I have done the balance and alignment by myself, with my son, and him alone. He also sees all of these exact same problems.

Seventh: The one motor has the same nice constant hum one expects from a high quality motor. The other motor has never sounded like that. The pitch of the sound goes up and down as if it were experiencing a significantly variable load. The last time I used it the motor was moving slower and slower. It was like I was running it off of a battery that was running out of charge but I always use my power supply.

I have done all of these steps several times each night. If there is a user error that explains all of these problems, then I want to hear it. The people at Orion are very nice and immediately ordered a replacement scope and I don't want to repeat it again on the new one.


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jrcrillyAdministrator
Refractor wienie no more
*****

Reged: 04/30/03

Loc: NE Ohio
Re: Celestron VX mount: experiences and problems new [Re: Dr.Don]
      #6066333 - 09/06/13 03:04 PM

Quote:

I can use the HC to move the scope in all 4 directions very smoothly. Then it stops responding to the right arrow button. I can push it multiple times or hold it down. After 1-3 seconds it suddenly slews at high speed in that direction like I had done a GOTO.




That's a symptom of an encoder problem.


Quote:

The one motor has the same nice constant hum one expects from a high quality motor. The other motor has never sounded like that. The pitch of the sound goes up and down as if it were experiencing a significantly variable load.




That's a symptom of an encoder problem.

It is not user error. It's an encoder problem.


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Susan H
member


Reged: 08/01/13

Loc: Texas
Re: Celestron VX mount: experiences and problems new [Re: jrcrilly]
      #6070706 - 09/09/13 05:31 AM

Hi John, I know very little about encoders, my knowledge wouldn't fill a thimble. If it is an encoder problem, is it within the mount itself or the HC? I'm experiencing similar issues. But, I'm going to try a few things before I go back to where I purchased my AVX from. I want to insure it's not operator error. I'm going to do a 2 + 4 alignment and see how that does. If we have to do those kinds of alignments, then why are 1, 2, and 3 star alignments offered? I also make sure I have balanced my mount, done a very good polar alignment, and that it's level. I hate to think that I have to return this mount for a second time. First time the place where power is plugged in was bad. I'm hoping its the HC and that can be easily replaced. And I don't want to purchase a different mount all together.

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SunBlack
scholastic sledgehammer


Reged: 05/05/11

Loc: Rome (IT)
Re: Celestron VX mount: experiences and problems new [Re: SunBlack]
      #6070948 - 09/09/13 10:09 AM

UP.....
Quote:

Some questions now:
1) What could be reason i had to correct frequently on DEC? ASPA inaccurate?
2) My Firmware versions are: HC: 5.22.3141 MC: 7.08.3071, should i upgrade something?
3) On Aligning and GOTOing, there's a feature that after pointing a star west to meridian, on going to a second star at east of meridian, i can avoid that the mount twists on itself, and goes to second star passing in front the meridian, doing "less road"? (my english is bad, i know)




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dragonslayer1
Pooh-Bah


Reged: 02/25/12

Loc: SLC, UT
Re: Celestron VX mount: experiences and problems new [Re: SunBlack]
      #6071016 - 09/09/13 10:51 AM

Hey Susan,
Wish I could help but please keep us up to date on how things work out or what the problem was,,, Thank you and good luck,
Kasey


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Dr.Don
member


Reged: 05/31/13

Loc: Northern California
Re: Celestron VX mount: experiences and problems new [Re: schluterdude]
      #6071677 - 09/09/13 04:55 PM

I guess I haven't explained the problem clearly enough. This is not about a precise goto problem. Its that it sometimes fails to respond to the HC right arrow button. By "fails to respond" I mean that it won't move at all (I really mean not at all) despite repeated pushing of the button or holding it down. Then it will suddenly slew so fast I can't even see the object move out of my FOV. One time it slewed so fast the finder hit me.

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nodalpoint
Pooh-Bah


Reged: 06/03/13

Loc: FEMA camp
Re: Celestron VX mount: experiences and problems new [Re: Dr.Don]
      #6073890 - 09/10/13 08:34 PM

Return it.

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moongold
member


Reged: 09/16/10

Loc: East Pa.
Re: Celestron VX mount: experiences and problems new [Re: nodalpoint]
      #6073970 - 09/10/13 09:29 PM

Same "problem" as DR. Don....slews fine on 3 buttons but the right direction button was like a slew speed 1 when it was set on 6. New to EQ so I thought it was me.

I noticed the more east the scope was pointing the worse the response was.


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cn register 5
scholastic sledgehammer


Reged: 12/26/12

Re: Celestron VX mount: experiences and problems new [Re: moongold]
      #6074365 - 09/11/13 03:33 AM

It might be a HC button problem, I've fixed a problem where a button didn't work unless you pressed it really hard. Also if you press an arrow button, then press the one on the other side the slew rate goes to full speed. That's a feature.

If the scope is aligned and tracking it's unlikely to be an encoder problem because the left/right movement is in the Ra direction and the mount will not track if the encoders aren't working.

Try doing a quick align and finding the Show position display. When tracking the Ra and Dec should not be changing. When moving the appropriate position should be changing. Also try the axis position, if the position isn't changing when the scope is moving then it might be an encoder problem.

If you don't feel like debugging the mount contact your dealer and get them to sort it out. That's what they are there for.

Chris


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Dr.Don
member


Reged: 05/31/13

Loc: Northern California
Re: Celestron VX mount: experiences and problems new [Re: cn register 5]
      #6074906 - 09/11/13 11:31 AM

I sincerely appreciate everyones' advice and suggestions. I have decided the mount is defective, the people at Orion agree with me and Celestron is shipping a replacement.

There is a big difference between the right arrow delivering a very very slow movement versus none at all, then a huge fast slew. In those cases the motor spun up and made the same sound, albeit briefly, like it does when moving large distances across the sky.

If the scope is not level, the latitude is completely wrong, and with grossly poor polar alignment the scope will not track properly. If I don't touch the HC the direction and rate of the FOV movement will be a constant. There will not be periodic large spikes in movement. By large I mean movement of the apparent size of several Jupiters.

I will use the new mount for 7-10 observing sessions and then let everyone know the result.

Don


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Dr.Don
member


Reged: 05/31/13

Loc: Northern California
Re: Celestron VX mount: experiences and problems new [Re: Dr.Don]
      #6081039 - 09/14/13 08:27 PM

I picked up my replacement AVX and the first night out it was very obvious that the previous one had serious problems. I use a polar scope to 'get close' and then 2 star alignment. After that it worked great. GOTO put 5 of 5 objects in FOV. The motors ran smooth and all HC buttons worked.

A big thank you to the folks at Orion Telescopes for making the replacement process fast and pain-free.


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RichardHK
sage


Reged: 11/25/06

Loc: Hong Kong
Re: Celestron VX mount: experiences and problems new [Re: Dr.Don]
      #6081873 - 09/15/13 11:13 AM

Wishing you well Don. I pick up my new AVX later this month and fingers crossed real hard I get a good one first time around!

Would be nice to see a poll here on how many Cloudy Nighters have received a good vs bad scope.


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rmollise
Postmaster
*****

Reged: 07/06/07

Re: Celestron VX mount: experiences and problems new [Re: Dr.Don]
      #6081889 - 09/15/13 11:26 AM

Quote:

I picked up my replacement AVX and the first night out it was very obvious that the previous one had serious problems. I use a polar scope to 'get close' and then 2 star alignment. After that it worked great. GOTO put 5 of 5 objects in FOV. The motors ran smooth and all HC buttons worked.

A big thank you to the folks at Orion Telescopes for making the replacement process fast and pain-free.




Doing calibration stars will do way more than polar alignment to ensure good go-to accuracy.


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rmollise
Postmaster
*****

Reged: 07/06/07

Re: Celestron VX mount: experiences and problems new [Re: RichardHK]
      #6081890 - 09/15/13 11:28 AM

Quote:

Wishing you well Don. I pick up my new AVX later this month and fingers crossed real hard I get a good one first time around!

Would be nice to see a poll here on how many Cloudy Nighters have received a good vs bad scope.




That poll would be absolutely meaningless due to the small numbers. In general, I'd say the VX introduction has actually had fewer hiccups than the CG5's did 10 years ago.


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RichardHK
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Re: Celestron VX mount: experiences and problems new [Re: rmollise]
      #6081907 - 09/15/13 11:42 AM

Quote:

That poll would be absolutely meaningless due to the small numbers. In general, I'd say the VX introduction has actually had fewer hiccups than the CG5's did 10 years ago.




Thanks Rod. Understood. I will add my experience here after running through everything at home before venturing outside. Will also do live ampere checks to compare with other thread info.


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KevH
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Re: Celestron VX mount: experiences and problems new [Re: rmollise]
      #6082550 - 09/15/13 06:12 PM

Quote:

Quote:

Wishing you well Don. I pick up my new AVX later this month and fingers crossed real hard I get a good one first time around!

Would be nice to see a poll here on how many Cloudy Nighters have received a good vs bad scope.




That poll would be absolutely meaningless due to the small numbers. In general, I'd say the VX introduction has actually had fewer hiccups than the CG5's did 10 years ago.




Why would the poll be meaningless? You sure seemed to think that you could infer something about lx80 problems through the number of posts about it on CN. Why is the VX different? It has certainly had plenty of problems reported.

Edited by KevH (09/15/13 06:21 PM)


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rmollise
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Re: Celestron VX mount: experiences and problems new [Re: KevH]
      #6082615 - 09/15/13 06:54 PM

Quote:



Why would the poll be meaningless? You sure seemed to think that you could infer something about lx80 problems through the number of posts about it on CN. Why is the VX different? It has certainly had plenty of problems reported.




I didn't infer that from just what I read on cotton-picking CN, though.

Not only is the number of VX owners who read CN relatively small, there is a much higher propensity for the folks who have problems to respond then those who have not, making a poll less than useful. I am not in charge here, though, and anybody who wants to run polls about the VX is fine by me.

If you think I am off the beam about the LX80, I invite you to purchase one. What do I know? Except...I have had hands on time with one, and I can tell you I was badly disappointed.


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KevH
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Re: Celestron VX mount: experiences and problems new [Re: rmollise]
      #6082668 - 09/15/13 07:28 PM

How many have you seen? Not that cotton pickin' many I'd guess. Sorry for the thread hijack, I'll let everyone get back to the VX discussion... Which looks like a decent mount btw.

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rmollise
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Re: Celestron VX mount: experiences and problems new [Re: KevH]
      #6083435 - 09/16/13 08:57 AM

Quote:

How many have you seen? Not that cotton pickin' many I'd guess.




Guess you'll never know now.

Edited by rmollise (09/16/13 08:58 AM)


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Jon_Doh
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Re: Celestron VX mount: experiences and problems new [Re: rmollise]
      #6083444 - 09/16/13 09:00 AM

I've had hands and time on the AVX and I am badly disappointed, not to mention frustrated. So it's going back.

There just doesn't seem to be a decent goto mount at a reasonable price point.

Edited by Jon_Doh (09/16/13 12:56 PM)


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Dr.Don
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Re: Celestron VX mount: experiences and problems new [Re: rmollise]
      #6083622 - 09/16/13 10:38 AM

How do people get their 9.25 attached to the scope? It seems very awkward and difficult. It's easy for me to move the mount from the house with the cw bar, but not weights attached. But getting the OTA onto the vixen is tough. Any hints? Maybe getting the mount into some particular orientation?

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Dr.Don
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Re: Celestron VX mount: experiences and problems new [Re: Dr.Don]
      #6084430 - 09/16/13 05:59 PM

I meant how do people get the 9.25 OTA attached to the VX mount?

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dragonslayer1
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Re: Celestron VX mount: experiences and problems new [Re: Dr.Don]
      #6084528 - 09/16/13 07:04 PM

Hey Don,
I have a CG-5, is close to yours. I have my 9.25 marked with a piece of tape on the mount bar so I always get it in same spot for DEC balance. Then I position mount head so rail tension screws have handles towards me and facing up (away from DEC cover)... I will state I did go with the ADM saddle tho but the sequence should be the same.
Kasey


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ur7x
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Reged: 01/08/12

Re: Celestron VX mount: experiences and problems new [Re: Dr.Don]
      #6084668 - 09/16/13 08:19 PM

My next door neighbor custom order a 9.25 HD Edge for his VX mount... Both work spectacularly. Fast and easy setup and the HD optics are really nice.

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Dr.Don
member


Reged: 05/31/13

Loc: Northern California
Re: Celestron VX mount: experiences and problems new [Re: dragonslayer1]
      #6086300 - 09/17/13 04:08 PM

Thanks Kasey.
I will try it that way. It is very awkward to get the vixen bar into the mount saddle without another person helping.
Don


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cn register 5
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Reged: 12/26/12

Re: Celestron VX mount: experiences and problems new [Re: Dr.Don]
      #6086342 - 09/17/13 04:35 PM

What I do is have the AVX saddle horizontal with the screws at the top and screwed well out.
Hold the OTA horizontally and slip it into the saddle so it is held at the bottom. Hold it up and tighten the screws to hold it in place. I'm doing this with smaller scopes but the same thing should do.

I've seen all sorts of ingenious ways to support OTAs while attaching them to a mount, one was to put the OTA down on a stool pointing down, adjust the mount to the same orientation and slide the OTA across so it is in the mount, then tighten the screws.

Chris


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SunBlack
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Reged: 05/05/11

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Re: Celestron VX mount: experiences and problems new [Re: cn register 5]
      #6094904 - 09/22/13 11:39 AM

Last night new sequence of PEC. After 4+2+ASPA, using 3x barlow and 9mm reticle eyepiece, I averaged 5 PEC sessions via PecTool. Then by photo session test, i'm arrived at 3 minutes at 0 Dec unguided, having only a micro Dec axis direction star trailing (<= 1 pixel), well corrected with the plugin StarRounder. Now, in respect to my ex Vixen GPDX, I improved by 50%. Tests carried out with a Canon 5d mkIII (pixel dimension 6.25) and Nikon 300mm telephoto.

I note a Dec axis stiffness, since i bought mount, so sometime i doubt if mount is well balanced in Dec. This stifness produces a backlash, which cannot be corrected by HC (i made some tests) , and at 2x motor speed, it's hard to make HC corrections (motor starts to move very late, exp in one direction). For now, a not big problem, when warranty expires, i'll take the mount for a fine tuning.


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Dr.Don
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Reged: 05/31/13

Loc: Northern California
Re: Celestron VX mount: experiences and problems new [Re: SunBlack]
      #6177792 - 11/05/13 04:48 PM

Did anyone notice anything funny with the mount when we changed back to standard time? We were doing some observing, everything was working great, GOTO was fine. We had been testing eyepieces on M45 and after adding another calibration star everything went crazy. The mount suddenly decided M45, Capella, and Aldeberan were now below the horizon. We twice cycled power and tried to get an alignment but that failed. I verified each time that it didnt suddenly think we were in dual-scope mode because sometimes we thought it could possibly be off by 90 degrees. The location/RTC were correct. All of this happened around midnight PDT. The next day I did a factory reset and everything seems fine now. Was it just a coincidence that it happened during the switch from savings to standard time?

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SkipW
sage


Reged: 02/03/11

Loc: Oklahoma, USA
Re: Celestron VX mount: experiences and problems new [Re: Dr.Don]
      #6178166 - 11/05/13 08:47 PM

Does this mount even know about DST or do you have to tell it?

Midnight isn't when the shift happens, anyway. I'm betting coincidence.


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rmollise
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Re: Celestron VX mount: experiences and problems new [Re: SkipW]
      #6178897 - 11/06/13 10:03 AM

You have to tell the mount about DST. Turn it off, now.

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Dr.Don
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Reged: 05/31/13

Loc: Northern California
Re: Celestron VX mount: experiences and problems new [Re: rmollise]
      #6179975 - 11/06/13 08:44 PM

The mount does ask about DST. It was on because it was DST then. Of course it is off now. But even if it was a PDT/PST issue, that would be a pointing error of 15 degrees, not something around 60-90 degrees. What bothered me was that cycling the power and doing another alignment did not fix the problem. We did it again and same result.
Believe me, my son and I verified multiple times that it had the right location and time.
Two days later I did a factory reset and sanity returned. Perhaps just a coincidence with the time change, but the error is really bothersome.

Don


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rmollise
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Re: Celestron VX mount: experiences and problems new [Re: Dr.Don]
      #6180524 - 11/07/13 08:40 AM

I'd say "coincidence," since I was using the VX during the DST change and noted no weirdness.

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