Re: [APML] Epson 4870 astro-scans

["Bobby Middleton" <bobm@koyote.com>]

Tim I think your scan is a bit out of focus compared to Kodak's. Your's also
has better star color.........
One of David Malin's tricks for recording correct star color of widefield
objects in his book was to defocus an image. Is that what's causing your
better star color?
Bobby Middleton


----- Original Message ----- 
From: "Tim Povlick" <potentate@san.rr.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Sunday, March 28, 2004 7:47 PM
Subject: [APML] Epson 4870 astro-scans


>
> 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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