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  #1  
Old 20-11-2018, 01:16 PM
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1.25" Coma Corrector for f5 Newton

Hi guys,

I love my 6" f/5 Newton, it has a lot of really good qualities.

BUT it comes with a 1.25" focuser and I cannot find a Coma Corrector in that dimension. A 2" coma corrector can be had everywhere but I do not want to change my focuser just to buy a coma corrector.

Has anybody got a 1.25" coma corrector to sell or know where to get one from?

Cheers,
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  #2  
Old 23-11-2018, 06:34 PM
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I thought that scope came with a 2 inch focused and has a 1.25 inch reducer?
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  #3  
Old 23-11-2018, 08:25 PM
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That is correct Karl.
raymo
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  #4  
Old 25-11-2018, 04:27 PM
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So if 2" there's a baader mpcc on sale in the classifieds!
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  #5  
Old 25-11-2018, 04:55 PM
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Hi guys,

my scope definitely has a 1.25“ focuser. It’s the Celestron scope in my signature.

Cheers,
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  #6  
Old 25-11-2018, 05:21 PM
raymo
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I'm confused, there are two different Omni XLT 150s, a 150mm Newtonian
reflector which changed from a 1.25" focuser to a 2" in 2013, and a
150mm refractor which has a 2" focuser, but I think this scope was discontinued a while ago. What exactly do you have? If you have a pre 2013 Newt you can fit it with a 2" focuser.
raymo
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  #7  
Old 25-11-2018, 06:12 PM
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Not sure if you are into DIY or not, but this guy made his own 1.25" coma corrector with off the shelf lenses, cost him $50 for the three lenses.


https://www.cloudynights.com/topic/4...oma-corrector/
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  #8  
Old 25-11-2018, 07:01 PM
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Quote:
Originally Posted by billdan View Post
Not sure if you are into DIY or not, but this guy made his own 1.25" coma corrector with off the shelf lenses, cost him $50 for the three lenses.


https://www.cloudynights.com/topic/4...oma-corrector/
Thanks for that link. I wish I would be able to do that. But I am not that talented. In the end I may have to consider replacing the focuser.
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  #9  
Old 25-11-2018, 07:08 PM
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Quote:
Originally Posted by raymo View Post
I'm confused, there are two different Omni XLT 150s, a 150mm Newtonian
reflector which changed from a 1.25" focuser to a 2" in 2013, and a
150mm refractor which has a 2" focuser, but I think this scope was discontinued a while ago. What exactly do you have? If you have a pre 2013 Newt you can fit it with a 2" focuser.
raymo
Hi Raymo,

My scope is from 2008 and came with a 1.25ď focuser. I havenít used this scope in a long while but would like to take some photos with it. My hope was that there is a commercial market for 1.25Ē coma correctors just hidden from my view. But if changing the focuser is the only way, then I might have to consider that and do some research.
Thanks anyways!

Cheers
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  #10  
Old 25-11-2018, 08:28 PM
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Before going any further I would suggest that you ensure that your Newt
can be used for imaging. Many Newts are made for visual, and a camera cannot get close enough to the scope to come to focus. If this is the case
the primary mirror would need moving further up inside the tube.
raymo
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  #11  
Old 26-11-2018, 05:48 AM
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Hi Raymo, I have been imagining with it for quite some time but since I changed to the ED 80 I got allergic to the coma
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  #12  
Old 26-11-2018, 11:36 AM
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Hi Max,

This will give you some ideas on how to make the focuser hole larger.

https://www.cloudynights.com/topic/6...arblast-6-ota/

Cheers
Bill
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  #13  
Old 27-11-2018, 10:30 AM
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Thanks Bill. Really helpful article. I guess I’ll have to start thinking about another focuser and what type of coma corrector I want. But I’m in no rush and think these are questions for another post at the time that budget and time allow a bigger investment. Thanks for all your helpful posts. Too bad though that there doesn’t seem to be an easy fix i.e. a commercially available 1.25” CC for a good price.

Clear Skies!
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  #14  
Old 27-11-2018, 02:11 PM
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While I was browsing Cloudy Nights this morning, it appears that Televue made a 1.25" Paracorr in the past. So you may be able to find a second hand one in the various Astromarts around the world.
Attached Thumbnails
Click for full-size image (TeleVue Paracorr 1.25inch.jpg)
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  #15  
Old 27-11-2018, 06:34 PM
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Quote:
Originally Posted by billdan View Post
While I was browsing Cloudy Nights this morning, it appears that Televue made a 1.25" Paracorr in the past. So you may be able to find a second hand one in the various Astromarts around the world.
Hi Bill, great!!! Iíll start hunting for one
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