RE: [APML] AIP4WIN

["Koebel, Alen" <Alen.Koebel@christiedigital.com>]

Roland Roberts wrote: 

> AIP4WIN will only work up to 16-bit FITS
...
> Also, there is/was a hard limit of 4k x 4k on the image size. 

Aha. Neither fact is mentioned on the Willmann-Bell web-site, 
AFAIK. Actually, there isn't much of a description at all on
the web site, that I could find. It's a strange way to sell 
software (i.e., with no adequate description of the features).
Thanks for the heads up. 

> For 35mm that's fine; you are unlikely to want to end up
> with much more than about 3k x 2k pixels for 35mm.  At that point you
> are already oversampling by about a factor of 2---the typical figure
> of merit for a photographic lens is a 25 µm spot size. 

Wouldn't TechPan and a really good lens or telescope have the 
potential to resolve better than this? Regarding oversampling,
don't you need to sample at 2 or more times your minimum feature
size to get "all" the information on the film? Or simply to 
ensure that your smallest stars aren't reproduced as single 
pixels for aesthetic reasons? 

Speaking of spot size, the smallest star images I've been achieving
on Elite Chrome 200, prime focus through a knife-edge focused 6" 
Meade Schmidt-Newtonian (definitely NOT Takashi or A-P quality :-),
are a little smaller than 0.04mm. Is this about as good as I can 
reasonably expect or should I be doing better?


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