[APML] Epson 4870 astro-scans

[Tim Povlick <potentate@san.rr.com>]

Hi Group,

I recently purchased an Epson 4870 and from what I can see so far it 
looks like it does a real good job of scanning film

Here is a 6x7 scanned in at 6k X 4k.

http://tim.povlick.com/photogallery/Capella.jpg

The scanner is capable of much more than this (10k X 10K) but the file 
sizes become unwieldy.

The 'blue' around Capella is on the film itself, not an artifact of the 
camera or telescope.

I scanned a similar image to the above, the difference was I put a small 
aperture mask in front of my TMB-152 and turned it into a 140mm or so.  
The aperture was not perfectly round; had some straight edges to it.  I 
scanned to core section of the 6x7 only and this time figured out how to 
make the 'blue' halo look like the transparency.

http://tim.povlick.com/photogallery/CapellaSpiked_2400dpi.jpg

Here is M20, from a piece off 6x7 Fuji film, 1200 DPI

http://tim.povlick.com/photogallery/M20_24bit_1200dpi.jpg

and again at 4800 dpi (big!)

http://tim.povlick.com/photogallery/M20_24bit_4800dpi.jpg

Here is (I think) the same image scanned professionally as a Kodak 
photo-CD PRO.

http://tim.povlick.com/images/Telescope/m20.jpg

It looks like the software package SilverFast is pretty good.  Is it 
just me or o these look a tad out of focus?  Is there a way to adjust 
focus on a scanner?

Epson says to place the film in emulsion side down.  Which side is 
that?  :-)  Should the lettering on the frames edge be up / down?  
Because of my confusion, I think some of my astro scans maybe mirror-imaged.

Comments Welcome.

___
Tim


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