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Dropped 4SE needs collimation (I guess)

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#1 Artemio

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Posted 28 November 2012 - 04:38 PM

:help:
Looking for advice:

Saddly, I dropped my 2.5 yrs old Nexstart 4SE :foreheadslap:, and even though nothing was broken (apparently), the images now are distorted (see attached pic). Collimation problems, I guess.

I'd read that, since the 4SE is a Mak telescope, it is not an easy task (if possible at all) to align the mirrors.

What would you advise me to do? should I try to fixe it myself? I only own this 4SE scope and never ever collimated anything before. Still doable?

I guess the cost of a professional fix would be more than the cost of getting a new 4SE? (I don't know how much it would cost, but I read in a fix company they would charges $80/hr.

Should I just get over it and sell the mount, recover something and buy a new one? Maybe that's the right thing to do, but I liked the 4SE and don't want to give up as easily.

Please, advice what do you think. :question:

Thanks!
Art

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#2 hamdul

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Posted 28 November 2012 - 05:22 PM

Art,
It appears that you took the picture of the star in focus.
Look at the star out of focus and see which way the rings are distorted. I believe that Celestron has a video on UTube that shows how to collimate a Mak. It is not difficult. I'll look for the video and forward it to you when I find it.
Fred

#3 Tel

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Posted 28 November 2012 - 06:42 PM

Hi Art,

Hoping Fred can find that Youtube video; but in the meantime, perhaps this link, (I think credited to our good CN friend and colleague, Hernando), might help ?

http://hyperionzooml...ating-nexsta...

I assume you are familiar with collimation by star testing ?

Best regards,
Tel

#4 Tel

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Posted 28 November 2012 - 06:51 PM

By the way, my apologies, Art: :bigblush:

Having just noticed that the above was your first post, I forgot to welcome you warmly to CN and to this forum in particular ! :bow: :bow:

Best regards,
Tel

#5 hopskipson

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Posted 28 November 2012 - 07:50 PM

That's a wild picture of Jupiter and the 4 moons. Sorry I'm of no help with your problem. Welcome to the forum :bow:.

James

#6 Artemio

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Posted 28 November 2012 - 09:49 PM

Art,
It appears that you took the picture of the star in focus.
Look at the star out of focus and see which way the rings are distorted.


Fred, I just did it using a 9mm EP. It looks like a "stand up" oval, with a "fat tummy" in the right side. I didn't find a better way to describe it :-)

I believe that Celestron has a video on UTube that shows how to collimate a Mak. It is not difficult. I'll look for the video and forward it to you when I find it.
Fred


Thanks! :bow: this is very reassuring!

#7 Artemio

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Posted 28 November 2012 - 09:53 PM

Hi Art,

Hoping Fred can find that Youtube video; but in the meantime, perhaps this link, (I think credited to our good CN friend and colleague, Hernando), might help ?

http://hyperionzooml...ating-nexsta...

I assume you are familiar with collimation by star testing ?

Best regards,
Tel


Thanks! nice surgery ;-)

#8 Artemio

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Posted 28 November 2012 - 09:55 PM

By the way, my apologies, Art: :bigblush:

Having just noticed that the above was your first post, I forgot to welcome you warmly to CN and to this forum in particular ! :bow: :bow:

Best regards,
Tel


Thanks all you guys, quick and sharp answers are all what I needed to start feeling like there is a still a hope for my 4SE :-)

I am sure I will enjoy this forum!

#9 Artemio

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Posted 28 November 2012 - 09:57 PM

That's a wild picture of Jupiter and the 4 moons. Sorry I'm of no help with your problem. Welcome to the forum :bow:.

James


hahaha ... yes, I know! it looks like a weird picture, with seagulls flying in a midnight sun , at the beach! :lol:

#10 Artemio

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Posted 28 November 2012 - 09:59 PM

Hi Art,
[...] I assume you are familiar with collimation by star testing ?

Best regards,
Tel


Nope, but I am always ready to learn ;)

#11 ibase

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Posted 28 November 2012 - 10:11 PM

Hi Art,

Hoping Fred can find that Youtube video; but in the meantime, perhaps this link, (I think credited to our good CN friend and colleague, Hernando), might help ?

http://hyperionzooml...ating-nexsta...

I assume you are familiar with collimation by star testing ?

Best regards,
Tel


Tel, thanks for the mention! :bow:

Art, the 4SE is a very nice scope worth the trouble of fixing, I motored 250km up the mountains just to have it fixed/collimated by an astro buddy, good luck!

Best,

#12 hamdul

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Posted 28 November 2012 - 11:01 PM

Art.
Sorry for the delay. Ilooked and found the video I was talking about, but it was not a Celestron one. Here is the address that should get you the data, http://www.youtube.c...nomyAndNatureTV

By the way I too want to welcome you to our group.and good luck with your collimation.
Fred
\P.S.
By the way for you Brits This is a British company that did the video

#13 hamdul

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Posted 28 November 2012 - 11:08 PM

Art,
Whoops!!!!!! I just clicked on the address that I gave you and found that it does not go directly to the video. You will have to scroll down to get it and as I recall when you scroll down you will run out of items but there is a tab that says something like "Get More" click on that and continue to scroll down till you find the video "How to collimate a schmidt- Cass. It's Way down on the list.
Fred

#14 Artemio

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Posted 28 November 2012 - 11:08 PM

Hi Art,

Hoping Fred can find that Youtube video; but in the meantime, perhaps this link, (I think credited to our good CN friend and colleague, Hernando), might help ?

http://hyperionzooml...ating-nexsta...

I assume you are familiar with collimation by star testing ?

Best regards,
Tel


Tel, thanks for the mention! :bow:

Art, the 4SE is a very nice scope worth the trouble of fixing, I motored 250km up the mountains just to have it fixed/collimated by an astro buddy, good luck!

Best,


Yes, I saw your post and the pictues of the major surgery!

So, as you are one of the few with first hand experience, would you say that it is doable? (I will have to drive more than 250Km, as I'm in Texas) :-)

Regards
Artemio

#15 Artemio

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Posted 28 November 2012 - 11:12 PM

Art,
Whoops!!!!!! I just clicked on the address that I gave you and found that it does not go directly to the video. You will have to scroll down to get it and as I recall when you scroll down you will run out of items but there is a tab that says something like "Get More" click on that and continue to scroll down till you find the video "How to collimate a schmidt- Cass. It's Way down on the list.
Fred


I found it ... but, it is for a Schmidt-Cassengrain (SCT). Sadly, the 4SE is a maksutov-cassegrain (MCT). I just learning that one of the slight differences between a SCT and a MCT, is that the last is not easy to collimate ... so sad!

Thanks for your time and I really feel welcome!

#16 Artemio

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Posted 28 November 2012 - 11:35 PM

Hi Art,

Hoping Fred can find that Youtube video; but in the meantime, perhaps this link, (I think credited to our good CN friend and colleague, Hernando), might help ?

http://hyperionzooml...ating-nexsta...

I assume you are familiar with collimation by star testing ?

Best regards,
Tel


Tel, thanks for the mention! :bow:

Art, the 4SE is a very nice scope worth the trouble of fixing, I motored 250km up the mountains just to have it fixed/collimated by an astro buddy, good luck!

Best,


Hernando, looking with more detail up to the pictures you posted, it seems to me that it is possible to collimate the tube by "just" opening the back to get to the "three factory collimation screws", without disassembly the whole thing, am I right? If so, then maybe this task is not as daunting as it looked at the beginning!

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#17 ibase

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Posted 29 November 2012 - 12:43 AM

Art, you don't have to travel half-way around the globe to get where I and my astro buddy's at because collimating the 4SE is really doable. And yes, as I've mentioned in this old Nexstar thread (click here), you may not have to go far in disassembling the scope to get to the factory collimation screws at the back (see diagram near the end of the old thread). As it will be the first time you'll be collimating a scope, it may take some trial & error to get there but it will surely be all worth it. And you've got nothing to lose really, I've almost given up on my 4SE before it got fixed. Good luck once again!

Best,

#18 Artemio

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Posted 29 November 2012 - 02:07 PM

Art, you don't have to travel half-way around the globe to get where I and my astro buddy's at because collimating the 4SE is really doable. And yes, as I've mentioned in this old Nexstar thread (click here), you may not have to go far in disassembling the scope to get to the factory collimation screws at the back (see diagram near the end of the old thread). As it will be the first time you'll be collimating a scope, it may take some trial & error to get there but it will surely be all worth it. And you've got nothing to lose really, I've almost given up on my 4SE before it got fixed. Good luck once again!

Best,


Thanks Hernando. Surely I will do what you mention as soon as I can, hopefully this weekend.

I will try to document the process, in case anyone else has the same problem in the future.

Thanks all you guys, I will post back once I have news ;-)

#19 ibase

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Posted 29 November 2012 - 02:55 PM

Art, you're welcome, looking forward to your post/documentation, thanks!

Best,

#20 orion61

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Posted 01 December 2012 - 12:37 PM

Welcome here, PM sent to you.

#21 Artemio

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Posted 03 December 2012 - 03:07 PM

Done!
I will post the report on how I did the whole repair later, but I want to inform that the collimation is not an issue anymore!
At the end, I was lucky everything ran smoothly and didn't broke anything :)

#22 Artemio

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Posted 03 December 2012 - 03:10 PM

Here is how Jupiter looks now (before any image processing). Note how the moons lost their wings :)

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#23 Artemio

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Posted 03 December 2012 - 03:12 PM

And, this is how it looks once I played (no stacking, just a single image) with contrast, exposure, bright and tone

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#24 ibase

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Posted 03 December 2012 - 06:01 PM

Great! :jump: Congrats! :bow:

Best,

#25 Artemio

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Posted 03 December 2012 - 10:33 PM

Well, here is the entire procedure.

First, this is how the Mirrors looked at the begining

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