RE: [APML] 4x5 astrocamera (again?)

["Loke Tan" <tan@cox.net>]

Dave,

 When you scan at 2500 dpi, this is equivalent to 10um per pixel. Does your
color film have this resolution? Probably not. I would guess that even 25um
per pixel is more resolution than the film plus optics gives. So all the
extra data gives you no additional information. You might as well scan at a
lower resolution.

Loke




> -----Original Message-----
> From: astro-photo-bounces@seds.org
> [mailto:astro-photo-bounces@seds.org]On Behalf Of D. Kodama
> Sent: Friday, May 07, 2004 9:55 PM
> To: astro-photo@seds.org
> Subject: Re: [APML] 4x5 astrocamera (again?)
>
>
>
> Wei-Hao,
>
> Thanks for the info on 4x5 film choices.  I recently picked up my own
> combo 4x5" and 6x9cm setup (Mitsuboshi) so the info is appreciated.
>
> Regarding E100SW, awhile back I tried it in 4x5 format but found that it
> had a tendency to go to yellow-green on long exposures.  I thought the "W"
> (warm) version of E100 would have better red response for nebulosity, but
> the green seems to overwhelm things.  I'd be interested in hearing if
> anyone has had a similar result.  I just shot a couple of test frames
> before becoming too busy to proceed further.
>
> By the way, one of the "downsides" of 4x5" is the size of the digital
> files.  My scanner can only do 2500 DPI, but at that resolution a 48-bit
> TIFF file is 750,000,000 bytes!
>
> Dave Kodama
>
>
> > Date: Thu, 6 May 2004 15:27:29 -1000 (HST)
> > From: Wei-Hao Wang <wang@IfA.Hawaii.Edu>
> > Subject: Re: [APML] 4x5 astrocamera (again?)
> > To: astro-photo@seds.org
> > Message-ID: <200405070133.i471Xml07592@galileo.ifa.hawaii.edu>
> > Content-Type: TEXT/plain; charset=us-ascii
> >
> > Hi Bobby,
> >
> > Yes, E100S is discontinued.  Now only 4x5 format (perhaps some
> > 120 format E100SW) is available.
> >
> > Wei-Hao
>
>
>
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>


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