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Subject: Re: Problem with 32mm ep on LX200
From: Todd Gross
Reply To: mapug@shore.net
Date: Fri Feb 17 03:39:34 1995

>I just reread your note a bit closer. I keyed in on the word "vignetting".
> What you seem to be describing is not called vignetting. It's curvature
>of field - not being able to get all parts of the field in focus at the
>same time. Vignetting is a darkening that appears toward the edge of the
>field and which gets worse the further off center you get.

>I don't think you should see curvature of field with that 32mm eyepiece. I
>don't see much curvature of field with a 40mm SWA and an f/6.3 SCT. Since
>it is a Meade and (by definition) prone to quality control problems (IMO),
>try borrowing a Nagler instead (if you have an aquaintence that will part
>with it). It sounds like you have a defective eyepiece - bad elements?

>FWIW, my guess.

My mistake.. I misused the word.. Well, do you think I would be better off with a 35mm Panoptic, than the 40mm SWA?... for an F/10 LX200??

BTW.. Meade was not very helpful when I called on this.. John just dismissed it as a fact of life that when you go wide, you go into "curvature of field", he said it would be worse at 40, and worse at 56, which I find hard to believe..

-Todd ------------------------------------------------------------------------------ Todd Gross Channel 7 Meteorologist, Boston ------------------------------------------------------------------------------ Email address: Toddg@shore.net Work Phone#: (617)725-0805 Personal 24 Hr. Wx Hotline: 976-6200 (508 & 617 only - 59c/min)