[APML] Re: (OT) IC1396 CCD with Schmidt-like FOV

[Philip Perkins <philip@astrocruise.com>]

Rob,

>I believe
>the FOV and detail compare favorably with schmidt camera and
>medium format film images of this object which demonstrates
>that large field color imaging can be done successfully with CCD
>and camera lenses.

The detail and FOV may compare favourably at *web resolution* with a medium 
format image.  But as you know (from your own excellent work with medium 
format) the medium format image has to be hugely downscaled for web 
resolution.  The raison d'etre for medium format (with you also I assume) 
is to produce large exhibition-quality prints while preserving the full 
integrity of the image (little or no upscaling).  By dowscaling for web 
resolution, the detail of a medium format image is compromised 
severely.  When comparing like for like, a full resolution medium format 
image (when scanned on your UMAX or equivalent) will yield a resolution of 
around 8,100 x 6,900 pixels.  I am not sure that an ST-10 image at 2,184 x 
1,472 pixels "compares favourably".  Much more detail will be apparent in 
the full resolution medium format image. The ST-10 image has nearly 18 
times less area.  And that is only the resolution aspect - in terms of 
field coverage the difference is even more stark.

--Philip

Philip Perkins - philip@astrocruise.com
Wiltshire UK & Luberon France
Astrocruise - http://www.astrocruise.com


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