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Old 10-03-2014, 11:06 PM
malau (David)
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How many of you using coma corrector?

I think I should get one... any thoughts?
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Old 11-03-2014, 05:21 AM
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Astroman (Andrew Wall)
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I use a Coma Corrector on my 8" f/4 scope purely for imaging though. On my 8" f/6 scope I don't feel it needs it, I haven't noticed any coma at the edges, although I do only have a couple of EP's to choose from.

EDIT: BTW what scope are you using to make you think you need one? I think any Newtonian below f/5 should really use one as the lower the focal ratio the more coma you will get.
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Old 11-03-2014, 07:43 AM
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multiweb (Marc)
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If you have a newt it's a must have accessory.
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Old 11-03-2014, 09:09 AM
malau (David)
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Thanks all.

I have skywatcher 150/750 f/5 and I found the edge of the pics the stars look like a comet ..then one day I've read another article for other stuff they talked about coma corrector thats why I have such thought....

reflector

Last edited by malau; 11-03-2014 at 09:10 AM. Reason: forgot to mention reflector...
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Old 11-03-2014, 10:30 AM
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alocky (Andrew lockwood)
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I use a Rowe corrector made by Baader in my 10" f4.5 for imaging. It needed some fiddling to get the spacing right between the sensor and the corrector, but worth it, IMO.
Visually it doesn't bother me, but it's a personal preference.
Cheers,
Andrew.
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Old 11-03-2014, 11:13 AM
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kosh (Goran)
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Hi David,

I use a Baader MPCC mk3 with my 8" Newt at F4. Here are two comparison photos, both single frames, first without, then with a coma corrector. Its not perfect( probably due setup ) but its much improved. Focus on the first shot was a bit out also.

Goran.
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Old 11-03-2014, 07:08 PM
malau (David)
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Quote:
Originally Posted by kosh View Post
Hi David,

I use a Baader MPCC mk3 with my 8" Newt at F4. Here are two comparison photos, both single frames, first without, then with a coma corrector. Its not perfect( probably due setup ) but its much improved. Focus on the first shot was a bit out also.

Goran.
Hi Goran,

Thats what Im after Thanks
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Old 12-03-2014, 01:39 PM
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jenchris (Jennifer)
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I have a problem with my focal reducer/field flattener (coma corrector) It's great as a focal reducer 10/6.3.
But I have an ACF meade OTA so it flattens an already flat field - resulting in stars becoming oval in the tangential aspect.
Here's an example of ETA (3 mins ISO800)
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