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

[Sean Walker <swalker@SkyandTelescope.com>]

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, I have to disagree with you here- Schmidt camera shots look
quite impressive at web resolution, but when blown up, the grain of the
film starts to become quite apparent. Rob's response sums it up for me
also.

Sean Walker


--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>