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Something for nothing: Celestron C90

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#2501 Cali

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Posted 15 March 2020 - 10:24 PM

Oops, only off by an order of magnitude...  I think we need to try a little harder.

 

I deny any responsibility as to what I may or may not have posted in the past. grin.gif

 

Jaimo! 

That's ok. It only seems like ~25,000. The 90mm is a fine little scope. I have a 127mm and it has never left me wanting. 

 

- Cal



#2502 Zapp Brannigan

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Posted 16 March 2020 - 12:00 AM

This thread does have over a quarter of a million views. 


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#2503 ANM

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Posted 01 April 2020 - 09:16 PM

Edmund Optics has self-adhesive flock paper that is .020" thick and $23 for two 20" x 30" sheets.

 

They also have non-adhesive flock paper that is .010" thick.


Edited by ANM, 02 April 2020 - 01:06 PM.


#2504 johnhudson922

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Posted 08 April 2020 - 02:36 PM

Re-edited my subs in Registax and combined a ton of panels to make this image (not sure if i've shared in this thread before). Its from December 2019

 

https://www.astrobin...xuxp/B/?nc=user


Edited by johnhudson922, 08 April 2020 - 02:37 PM.

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#2505 Jaimo!

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Posted 09 April 2020 - 05:16 PM

Re-edited my subs in Registax and combined a ton of panels to make this image (not sure if i've shared in this thread before). Its from December 2019

 

https://www.astrobin...xuxp/B/?nc=user

That is OUTSTANDING!


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#2506 ANM

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Posted 09 April 2020 - 06:05 PM

Nice! What scope was used?

#2507 johnhudson922

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Posted 09 April 2020 - 06:08 PM

Nice! What scope was used?

Thanks!

 

That is OUTSTANDING!

C90, of course!



#2508 realcomix

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Posted 09 April 2020 - 06:10 PM

Re-edited my subs in Registax and combined a ton of panels to make this image (not sure if i've shared in this thread before). Its from December 2019

https://www.astrobin...xuxp/B/?nc=user

Amazing amount of detail!

Sent from my SM-N975U using Tapatalk
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#2509 ANM

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Posted 09 April 2020 - 06:13 PM

Wow I am impressed! It looks sharp enough to cut if you brushed against it!
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#2510 johnhudson922

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Posted 09 April 2020 - 06:44 PM

Here's a closeup of the Plato and Alpes area...decent amount of detail!

https://www.astrobin...k0vu/0/?nc=user


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#2511 ANM

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Posted 09 April 2020 - 06:57 PM

Here's a closeup of the Plato and Alpes area...decent amount of detail!
https://www.astrobin...k0vu/0/?nc=user

Are you sure you didn't confuse your C90 with a C9.25?
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#2512 HaroldC3

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Posted 18 April 2020 - 08:58 AM

So I’m look to purchase this mighty little scope.  Is there any consensus as to whether the vintage orange tube is better to get or the brand new spotting scope version?  



#2513 ANM

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Posted 18 April 2020 - 09:19 AM

Ugh...  I am going to have to work out my guide scope issues, as 1 minute unguided subs at ~f/14 will not cut it (and I could not pull off 2minute subs).  I have imaged this at ~f/4.7 and at f/7, but the C90's long focal length will require much longer subs.  Below is my shameful and quick processing of M81, I am not going to waste too much time on the colors and processing, but will share my failure.  I don't want to turn this into an imaging thread and to stay on the C90 topic...  But the bottom line is the C90 will require a significantly longer exposure than a short focal length refractor.  I know this is not the most optimal imaging scope, but this has become a challenge...  For reference, here's NASA's Hubble image.
 
attachicon.gifAutosave - M81 C90.jpg

Jaimo!, I don't see why you think this image is so bad, seems to me it just needs
processing in the computer. For a C90 there's an excellent amount of detail. It's
not the Hubble and never will be.

#2514 MCJ2087

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Posted 18 April 2020 - 09:34 AM

So I’m look to purchase this mighty little scope.  Is there any consensus as to whether the vintage orange tube is better to get or the brand new spotting scope version?  

I don’t have a consensus comparison for you.  The focus collar on my 80s C90 took some getting used to.  The one that I bought doesn’t have the special coatings, so there’s some loss there.  For me, it was a cost effective way to do some astronomy.  Enjoy whatever choice you make, and use the heck out of it.



#2515 Old Man

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Posted 18 April 2020 - 04:28 PM

I recently purchased the new style C90 and am more than happy with it. I have some hand held phone pics on page 100 of this thread, taken at 250x of a redtailed hawk.

Images were getting a little soft at that power, but I was pleased. I got mine through Optics Planet, the cheapest price I could find.



#2516 ANM

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Posted 18 April 2020 - 04:33 PM

Here's my new ETX-C90 Observer:

IMG_1321 2.jpeg

The ETX's RDF was junk, and with the 90mm Mak the fl is too long to find objects
without it, so I did a quick temporary attachment of the C90 to the ETX mount,
now I can observe tonight!
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#2517 Michael Rapp

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Posted 18 April 2020 - 08:10 PM

I used my C90 (the newer spotting scope version) recently after not having used it for about three years.  I forgot how much fun and convenient this scope is on double stars!  It is just fun to use!  (Mount is LXD-75.)

 

I keep thinking about getting an ED100 refractor for double star work.....and I'm sure it would be a bit better, but will it be $800 better?  Subjective, to be sure, but for me....I don't think so.  Plus the C90's eyepiece location is always convenient.


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#2518 ANM

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Posted 20 April 2020 - 12:21 PM

I used my C90 (the newer spotting scope version) recently after not having used it for about three years.  I forgot how much fun and convenient this scope is on double stars!  It is just fun to use!  (Mount is LXD-75.)
 
I keep thinking about getting an ED100 refractor for double star work.....and I'm sure it would be a bit better, but will it be $800 better?  Subjective, to be sure, but for me....I don't think so.  Plus the C90's eyepiece location is always convenient.

I just recently bought my C90 on eBay and so far I think it's great! I had one many years ago
and sadly let it go. That will not happen again!

#2519 Broglock

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Posted 20 April 2020 - 03:59 PM

Wow, I would of never expected so many C90's. Awesome my first scope and will always be my goto. I thought I was an oddball (probably still am lol.gif )! I will never forget the first viewing of the moon and Iwill never get rid of my C90!

2020 04 13 12 02 22
Album: Scopes
1 images
0 comments


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#2520 mtminnesota

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Posted 20 April 2020 - 10:27 PM

I just ordered one for $127.49 +  tax, including delivery.  It comes with a (unusable, probably) tripod, 3-way panhead, and backpack.  I couldn't resist!

 

 

https://www.opticspl...-with-trip.html


Edited by mtminnesota, 20 April 2020 - 10:33 PM.

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#2521 Orion68

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Posted 20 April 2020 - 10:44 PM

I had an Orange tube C90, which I bought used, and it was very mushy at all magnifications. I sold it to someone who swore it could be collimated to solve the problem, but I could never find a way to adjust the optics.

 

In all other ways I liked it.



#2522 HaroldC3

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Posted 21 April 2020 - 07:15 AM

I just ordered one for $127.49 +  tax, including delivery.  It comes with a (unusable, probably) tripod, 3-way panhead, and backpack.  I couldn't resist!

 

 

https://www.opticspl...-with-trip.html

Thanks that nudged me to finally order it.  Now off to find a decent but budget friendly panning tripod head.


Edited by HaroldC3, 21 April 2020 - 07:19 AM.

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#2523 Jaimo!

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Posted 24 April 2020 - 02:46 PM

I went out a couple of times this week to try and image Venus...  After mount issues one evening, then clouds rolling in just after I was polar aligned, finally had a clear evening.  I should have started earlier so Venus was higher in the sky and it looks a little under sampled.  I did get a few images, but I have a little more work to do.

 

Ven_214920_lapl4_ap5.jpg

 

C90, ASI224MC, AS!3


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#2524 Jaimo!

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Posted 24 April 2020 - 02:54 PM

So I’m look to purchase this mighty little scope.  Is there any consensus as to whether the vintage orange tube is better to get or the brand new spotting scope version?  

Sorry for the late response...  But the new Synta sourced scope, so I have read, is a better scope than the 1970-1980's orange C90.  It also has 1.25" visual back, vs. the 0.965" on the older orange version.   But ANM's ETX-C90 hybrid is very interesting.

 

Sorry, please do not hate me all of you orange C90 lovers...  tonofbricks.gif  

 

Here's a quick video comparing the two.


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#2525 ANM

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Posted 24 April 2020 - 03:13 PM

Can anyone tell me what this screw does? Is the corrector going to fall off if I undo it? Or just the primary mirror?

IMG_1326.jpeg

Thanks!


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