Re: [APML] Epson 4870 astro-scans

[Duncan Munro <dmunro@sfu.ca>]

I have been browsing through the yahoo Epson3200 user group and came 
across several posts where, by trial and error, it was determined that 
the point of best focus for transparencies for Epson scanners is often 
slightly different from the stock film holders. See:

http://www.pbase.com/avw99/3200

for an example.   Apparently adding shims to the stock film holders can 
make quite a difference.

I am really happy to see that the 4870 performs well. Thanks for sharing 
your images.

clear skies.

Duncan Munro

Tim Povlick wrote:

> Bobby Middleton wrote:
>
> Hello Bobby,
>
>> Tim I think your scan is a bit out of focus compared to Kodak's. 
>> Your's also
>> has better star color.........
>>  
>>
> It does look out of focus I must say.  I'll check the transparency 
> under a microscope to be sure.  I thnk it's possible the 'Kodak' 
> version was scanned with unsharp mask which might make the focus look 
> better.  As to the color, that is what is really on the transparency, 
> the scanner is seeing the things correcttly, perhaps out of focus.  I 
> checked the Epson help and there is supposed to be a focus dialog, but 
> I can't find it.  Instead I did
>
> I had a piece of hypered Royal Gold 400 that I shot with the TMB-152, 
> an AstroPhysics 0.75x focal reducer and a Nikon camera.  I scanned it 
> in at 2400dpi,  8 scans summed to one.  Here is it:
>
> http://tim.povlick.com/photogallery/m42_35mm_2400dpi_8Xrescans.jpg
>
> It looks like focus is fine to me, what you think?  Maybe the focus 
> aid I use for the 6x7 is a tad off?  (I didn't realize is but this 
> maybe one of my better pics ever)
>
> Thanks for your expert help.
>
>
>> 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?
>>  
>>
>
> The transparency really looks this good.  It looks like the Epson 4870 
> kills the kodak photoCD scanner.
>
>> Bobby Middleton
>>
>>  
>>
>
> Tim
>
>
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>


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