1. My comment about PEC being off in Altaz is true even if you are using a
derotator.

2. The CCD chip size is smaller than film, requiring larger enlargement. Small
tracking errors (several tens of arc seconds) will visibly affect CCD images and
are less obvious in film images (unless greatly enlarged).

Ralph

The Ways wrote:

> -----Original Message-----
> Date: Wednesday, April 21, 1999 2:45 AM
> Subject: mapug-digest V1 #1719
> Thanks for all the responses to my query for feedback on the ST-7 vs the
> 416XT. I should have mentioned that I currently use a field derotator and
> 35mm film with pretty good results. This however, raises questions about
> using a field derotator with CCD photography in general. I would like to
> hear from anyone who has experience with both modes of CCD imaging - (e.g.
> polar alignment and ALTAZ w/field derotation modes of CCD imaging)

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