Re: [APML] New images uploaded

["Alson Wong" <alsonwong@earthlink.net>]

There is some color shift with a 50mm lens.  For my shots of Orion, where
the Milky Way is predominantly blue, I had to crop the edges out.  It
doesn't look as bad with Sagittarius because that portion of the Milky Way
is redder to begin with.  The filter does cut out a lot of the yellow, which
is apparent when you compare the image of Sagittarius with the image of
Scorpius, which I took without the IDAS filter.  The only adjustment I made
to the colors after scanning was to adjust the RGB levels at the low end.
As it is, you can still see that the bottom center of the image is greener
than the bottom sides.
--
Alson Wong
Riverside Astronomical Society
     http://www.rivastro.org/
Visit my Web page at:
     http://home.earthlink.net/~alsonwong/index.htm

----- Original Message -----
From: "Grant" <GB1029@inter-linc.net>
To: <astro-photo@seds.org>
Sent: Monday, August 27, 2001 7:57 AM
Subject: Re: [APML] New images uploaded


> Alson,
>
> Both images are nice.  I also have a Hutech Lps for wide field work.  I
had
> always wondered
> how bad the color shift would be with a 50mm lens.  Did you make many
> adjustments in PS to
> help correct the color shift?
>
> Grant



--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>