Re: [APML] Help with this image

["Chris Schur" <cschur@cybertrails.com>]

Nicola,  Id toss that lens.  its off centered coma.  the lens elements must
have at least one element inside that is not optically centered.

Chris Schur
----- Original Message -----
From: Nicola <nmontec@libero.it>
To: astro-photo <astro-photo@seds.org>
Sent: Thursday, July 03, 2003 4:57 AM
Subject: [APML] Help with this image


> Dear All,
>
> I just came back from a Star Party at Frabosa Soprana (CN), Italy and I
tried
> for the first time a medium format camera of mine (Pentacon SIX TL) which
a
> bargained last october, willing to try medium format world.
> I was very disappointed with the result of the image at the edge, the
stars look
> very funny despite i stopped down the lenses of two stops (f/4).
> This is the raw image just came straight out of the scanner.
> At the beginning i thought it was coma, but I noticed for instance that
the
> aberration is no centered in the centre of the frame but slightly down
right, so
> there must be something else apart from a serious coma. Moreove some fo
the
> stars look like a small crescent moon on one side).
>
> Can you please all fo you experts out there try to figure out what
happened?
>
> Ciao!
> Nicola
>
> http://astrofoto.laza.it/astrophotos/Resized_Cygnus.jpg
>
> Astrophotos By
> Nicola @
> http://astrofoto.laza.it
>
>
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