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Equipment Discussions >> Mounts

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jrcrillyAdministrator
Refractor wienie no more
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Reged: 04/30/03

Loc: NE Ohio
Re: Celestron VX mount [Re: jrbarnett]
      #5614781 - 01/10/13 12:50 AM

Quote:

John, where'd you find photos?




Sorry - Celestron added the mount to their site sometime after this thread started.


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mclewis1
Thread Killer
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Reged: 02/25/06

Loc: New Brunswick, Canada
Re: Celestron VX mount [Re: jrcrilly]
      #5614783 - 01/10/13 12:51 AM

So it appears we have lots of good changes with the VX mount compared to the CG-5 ...

Same HC - NexStar+ (very important for compatibility and functionality benefits)
Additional AUX port (good for accessories like SkySync and SkySense - no need for an AUX port extender)
Better alt and az adjustments (nice change for folks in the field who are always changing the positions)
Better motors and gearbox (faster slews and hopefully lower PE)
Smaller motor housings (good for clearance issues)
Mechanically able to track 20° past the meridian (good, less inadvertent meridian flips)
External dec cable (similar to original but appears to be shorter and routed better)
Same counterweight shaft diameter (good for compatibility with original CG-5 CWs)
Shaped 11lb counterweight (good for clearance issues at lower latitudes)
Similar tripod (good for stability)
PEC (good for imagers)
RTC (good - should be able to hibernate and come back without data input)
Better saddle (two bolts and wide spacing will provide more robust clamping and still use same dovetails as on CG-5)
Thread on power connector - like CGEM/CGE Pro (good, will eliminate many intermittent electrical issues)

What I didn't like ...
Tripod leg clamp knobs are still on the outside (cable snagging potential)
Increased amperage requirement (not a big deal but will push folks to the 5 amp CGEM/CGE Pro AC power adapter which is 3x the price of the 2.5 amp model) - and I'll bet the very poor Celestron DC power cable will now become even more of an issue unless it's been upgraded too.

Still to be answered ...
Bearings used on the DEC axis?
How smooth the DEC axis is when autoguiding (and amount of backlash)
PE targets and how smooth the transitions are


So in general there are nice improvements for visual work and big improvements for imagers. For an extra $100 (and actually a bit more since CG-5s are not sold at list) the VX looks like a clear winner.


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Mariner@sg
sage
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Reged: 06/28/12

Loc: Little Red Dot
Re: Celestron VX mount [Re: frozen.kryo]
      #5614835 - 01/10/13 02:15 AM

Quote:

Wider latitude range... yet it only does 7 to 77 degrees??

Didn't the CG5 go from 0 to 90 degrees? How to you go wider than that? Am I missing something here?

Anyway, it looks like a great mount. I liked my CG5. Hope this new mount isn't as noisy as the old one.




Sigh. Low latitude users like myself needs more love here....



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cn register 5
scholastic sledgehammer


Reged: 12/26/12

Re: Celestron VX mount [Re: Mariner@sg]
      #5614898 - 01/10/13 03:56 AM

I checked mine, the latitude goes to just under zero degrees.

I've no idea about the bearings and I'm not about to take it apart.

I've not checked the power draw but the PSU is probably sized for the peak loads as the motors start. There are plenty of less expensive sources of power.

My guiding graphs look pretty good to me, peak error of a fraction of a pixel - when there's no cloud in front of the star at least.

The PEC graphs look reasonably smooth and consistent from cycle to cycle to me, with a peak to peak of about 25". I was able to use PECTool with PHD guiding to collect the PEC data.

Chris


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frozen.kryo
super member


Reged: 01/28/11

Loc: East of the Sun, West of the M...
Re: Celestron VX mount [Re: cn register 5]
      #5614907 - 01/10/13 04:20 AM

How about the noise level at max slew? Any improvement over the CG5GT? The motor covers look a lot better compared to the old 'resonators'.

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rmollise
Postmaster
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Reged: 07/06/07

Re: Celestron VX mount [Re: frozen.kryo]
      #5614998 - 01/10/13 07:55 AM

Quote:

Wider latitude range... yet it only does 7 to 77 degrees??

Didn't the CG5 go from 0 to 90 degrees? How do you go wider than that? Am I missing something here?

Anyway, it looks like a great mount. I liked my CG5. Hope this new mount isn't as noisy as the old one.




Yep, you are.

The CG5 did not really go from 0 to 90. If you wanted to go below about 30 degrees, you had to remove the front altitude adjustment bolt, which was the first thing I had to do when I got my mount.


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rmollise
Postmaster
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Reged: 07/06/07

Re: Celestron VX mount [Re: jrbarnett]
      #5615001 - 01/10/13 07:56 AM

Quote:

Is it a Sirius/HEQ-5 derivative?






I'd have to say "no," since it uses servos. Looks like the offspring of Mama CG5 and Daddy CGEM to me.


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EFT
Vendor - Deep Space Products
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Reged: 05/07/07

Loc: Phoenix, AZ
Re: Celestron VX mount [Re: rmollise]
      #5615174 - 01/10/13 10:13 AM

Quote:

Quote:

Autoguider port (which the CG-5 already has)
New motors (which should mean new gearbox and therefore hopefully won't have the 8/3 period errors)





I know this is something of a problem with the CGEM, but I have never seen nor heard tell of it in a CG5... Mr Ed, what say you?




It is somewhat strange that the 8/3 problem has never (to my knowledge) been reported with the CG-5 that uses the same motors as the CGEM. I don't know of any reports of motor cogging either. The CGEM uses a completely different motor board than the CG-5. The CG-5 board is derived from the same family of boards used by the CGE and Nexstar mounts and that is likely what makes the difference with the cogging. However, in regards to the 8/3 issue, I suspect that the 8/3 error is there with the CG-5 but it is lost in the noise of the mount in general. The improved design, gear quality and stability of the CGEM is likely the reason why the 8/3 error is more apparent since there is no other reason that the CG-5 should not have this error.

Hopefully, they have addressed these potential issues with the new mount.


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EFT
Vendor - Deep Space Products
*****

Reged: 05/07/07

Loc: Phoenix, AZ
Re: Celestron VX mount [Re: jrbarnett]
      #5615200 - 01/10/13 10:31 AM

Quote:

Is it a Sirius/HEQ-5 derivative?

It sounds like Celestron has a great bundle with this new mount plus a C8 Edge HD OTA for under $2k.

I was considering an 8" Edge HD OTA to experiment with anyway. It sounds almost like I'd be nuts not to hold off a bit and get this mount + OTA bundle.

"The star of the series is the Advanced VX 8” Edge HD, which combines Celestron’s best optical design with the Advanced VX for a stellar astroimaging telescope under $2,000."

Star sense also sounds like a nifty little tool for popularizing and democratizing astronomy. So easy even a caveman can use it to align a GOTO mount.

Regards,

Jim




Definitely not a Sirius/EQ5 derivative. It clearly uses the same general structure as all Vixen GP clone mounts in this catagory. For me, if they added bearings to the DEC axis it will be a winner. Improving the bearings on the RA would be a bonus.


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EFT
Vendor - Deep Space Products
*****

Reged: 05/07/07

Loc: Phoenix, AZ
Re: Celestron VX mount [Re: jrcrilly]
      #5615207 - 01/10/13 10:34 AM

Quote:

Quote:

Obviously if the new VX works as anticipated this will put pressure on the basic CGEM, why pay $500 more for basically 10 lbs of additional payload?!?




The mounts are more different than the 30 pound/40 pound specs imply. Bigger gears, bearings, etc. The CGEM minus tripod weighs more than twice the weight published for the bare VX so it's substantially beefier (weighs about the rated capacity, rather than 1/2 the rated capacity). The price difference will still be justified for those wanting something more substantial - but with any luck the VX will be even more bang for the buck than the CG-5 was, and that's saying something!




I agree that this is vastly different from the more robust CGEM design and will only compete with the CGEM as much as the CG-5 does. Its competition will be the Orions, Skywatchers and Vixens with similar configurations.


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jrbarnett
Eyepiece Hooligan
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Reged: 02/28/06

Loc: Petaluma, CA
Re: Celestron VX mount [Re: jrcrilly]
      #5615234 - 01/10/13 10:51 AM

Thanks John!

That's a very nice "clean up" of the CG5-GT.

Regards,

Jim


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jrcrillyAdministrator
Refractor wienie no more
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Reged: 04/30/03

Loc: NE Ohio
Re: Celestron VX mount [Re: jrbarnett]
      #5615271 - 01/10/13 11:09 AM

Quote:

That's a very nice "clean up" of the CG5-GT.




Nice turn of phrase, Jim. I wish I'd said that. Yes, it's clearly an update and adds some missing features plus there may be some performance improvement as well. At $800 it could well be an even better value than the $700 CG-5GT was.


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tjugo
scholastic sledgehammer


Reged: 11/06/07

Re: Celestron VX mount [Re: jrcrilly]
      #5615366 - 01/10/13 11:57 AM

IMO, the Cg5's achilles heel was the lack of bearings in the DEC axis, that made imaging more challenging even with light loads. I hope the VX has bearings on both axes. I want to move away the idea of getting an iOptron for my portable setup...

Cheers,

Jose

Edited by tjugo (01/10/13 12:12 PM)


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astro_baby
scholastic sledgehammer


Reged: 06/17/08

Loc: United Kingdom
Re: Celestron VX mount [Re: tjugo]
      #5615536 - 01/10/13 01:26 PM

Theres some pics here

http://www.firstlightoptics.com/celestron-mounts/celestron-advanced-vx-mount....


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Cow Jazz
professor emeritus


Reged: 11/24/03

Loc: Toronto, Ontario
Re: Celestron VX mount [Re: tjugo]
      #5615588 - 01/10/13 01:53 PM

This looks like a definate upgrade from the old CG5AS, but I think I'll still spend the extra bucks for an HEQ5Pro when the time comes. If this works as advertized, good on Celestron.

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EFT
Vendor - Deep Space Products
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Reged: 05/07/07

Loc: Phoenix, AZ
Re: Celestron VX mount [Re: astro_baby]
      #5615695 - 01/10/13 03:02 PM

Where is the power connection? I can't see it in the photo.

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cn register 5
scholastic sledgehammer


Reged: 12/26/12

Re: Celestron VX mount [Re: Cow Jazz]
      #5615750 - 01/10/13 03:41 PM

I don't know what bearing type it uses and I'm not about to take it apart to find out. What I can say is that it guides well in Ra and Dec.

The latitude adjustment goes down to slightly less than zero degrees, but I'm not sure if the counterweight will miss the tripod at low latitudes, that may be why it's specified as 7 degrees.

I ended up doing far less playing with/testing the mount than I hoped because of the continuous clouds but found that it was quite easy to set up guiding, just run the PHD guiding calibrate function. I think I did have PEC on.

Chris


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WarmWeatherGuy
Carpal Tunnel
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Reged: 08/27/11

Loc: Orlando, FL 28° N, 81° W
Re: Celestron VX mount [Re: cn register 5]
      #5615865 - 01/10/13 04:46 PM

Here it is on their web site:
http://www.celestron.com/astronomy/celestron-advancedvx-mount.html

Price is $800
Latitude range is 7-77°

Here is a video by YouTuber CelestronDotCom
https://www.youtube.com/watch?v=AiKDoxjmtmU


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Orionis91
sage
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Reged: 03/01/10

Loc: Maryland USA
Re: Celestron VX mount [Re: ghataa]
      #5615886 - 01/10/13 04:56 PM

I want one :P it looks so cool and it has a bunch of ergonomic upgrades like bigger knobs and reshaped housings. should be fun :P.

Dave


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dandabson
super member


Reged: 10/15/08

Loc: Dover, DE
Re: Celestron VX mount [Re: Orionis91]
      #5615996 - 01/10/13 06:21 PM

Anxiously awaiting this hitting the internet shelves. Looks like a viable option in today's market. Can't wait to hear reviews of this mount.

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