Re: [APML] re: E200 images all very red

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

What kind of camera are you using? Are you removing the pentaprism?
Bobby Middleton

"God doesn't play dice".........
Albert Einstein on blind chance
http://www.koyote.com/users/bobm/astro1.htm

----- Original Message -----
From: Mark Park <mark_park@hotmail.com>
To: <astro-photo@seds.org>
Sent: Wednesday, September 19, 2001 12:39 PM
Subject: [APML] re: E200 images all very red


> I have the film developed at a local shop, the red is uniform across the
> frame.  The tint does not show up on the piggyback exposures (50mm lens,
> Approx 45 mins).  But does show up on the prime focus exposures.  It can't
> be from an LED because I use a CCD to auto guide.  I try not to let any
> light hit the scope or camera when shooting, though it is possiable that
my
> red flash light did shine on it a couple of times.  It seems odd that the
> prime focus exposures all have it and the piggy back ones don't.  I wonder
> if the T-addapter was not on snuggly.
>
> The red tint does not look like the light leak example. It is uniform
across
> the frame.  I would expect the processing, except for the prime  focus
> exposures.
>
> Here are three of the full frame images, size reduced, unprocessed, low
> res...
> http://www.wilkes.net/~tspark/images/red_m17.jpg
> http://www.wilkes.net/~tspark/images/red_m77.jpg
> http://www.wilkes.net/~tspark/images/red_n7662.jpg - the blue snowball
isn't
> blue any more :~)
>
> Thanks
>
> >------------------------------
> >
> >Date: Tue, 18 Sep 2001 20:51:22 +0200
> >From: "Ulrich Beinert" <analemma@gmx.de>
> >Subject: AW: [APML] E200 images all very red
> >
> >Or a light leak when developing. Did you develop yourself? I've >managed
to
> >close the developing canister incompletely, and got nice red artefacts
>on
> >the film. but it was like a pattern, not uniform.
> >
> >Ulrich
> >
> >
> >>Another possibility is a camera light leak from a red led (st-4, >power
> >>supply, reticle, etc)
> >>Bobby Middleton
> >
> >
> >- --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
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> >------------------------------
>
>
> Mark Park
> Mark_park@hotmail.com
> AstroPhoto Page:http://www.wilkes.net/~tspark/astrphts.htm
> Home Page: http://www.wilkes.net/~tspark/
>
>
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