Re: [APML] Coma corrector needed ?

["Mike & Dianna" <galaxy@ncweb.com>]

Hi Bill,

I have a home built 8" F3.5 newt for AP only . When I researched coma
correctors, Lumicons and the TeleVue parracor, I found that the Lumicon has
a larger area of glass than the Televue....therefore less vingetting.
So far I am very happy with the Lumicon coma corrector. It seems to correct
very well, alsmost to the edge of the 35mm frame. It does have to be spaced
properly from the film plane. I dont remember the exact distance off the top
of my head. Lumicon should be able to tell you.

Mike Leitch
galaxy@ncweb.com
Astrophotography website
http://www.ncweb.com/~galaxy/home/astropho.htm

----- Original Message -----
From: William R. Mattil <wrmattil@ix.netcom.com>
To: <astro-photo@seds.org>
Sent: Friday, February 15, 2002 10:52 AM
Subject: [APML] Coma corrector needed ?


> Gentlemen,
>
> Having ordered a new Optical Tube Assembly to augment my existing 10"
> f/6 Newtonian I have decided upon either a 12.5" or 10" f/4. Not ever
> having owned a "faster" scope I am curious if I will need a coma
> corrector for this. This will be specifically for 35mm astrophotography.
> Also any suggestions as to how I can achieve maximum illumination (ie:
> minimal vignetting) would be appreciated. The only coma corrector that I
> am aware of is the Lumicon. Are there others ? Any recomendations ?
>
> As always any advice would be greatfully appreciated. FWIW the OTA will
> be a Parks
>
> Regards
>
> Bill
> --
> William R. Mattil | Fred Astaire wasn't so great.
> wrmattil@ix.netcom.com | Ginger had to do it all backwards
> (972) 399-4106 | and... in high heels.
>
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