Re: [APML] interference pattern on negatives

[Roland Roberts <roland@astrofoto.org>]

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>>>>> "Joe" == Joe Pedit <pedit@email.unc.edu> writes:

    Joe> I opened the images in Photoshop and the Newton-like rings
    Joe> are in each of the red, green, and blue channels.  Again, the
    Joe> pattern is on the negatives -- any thoughts on its origin?

You don't quite say this, but I assume you also looked directly at the
negatives on a light table or held up to a light and saw them, right?

Assuming that is the case, it's possible it's just water marks, I've
seen this on some of my film when developed at a local drugstore.
What I've done is bring the film home, soak it for a minute or two in
cool water, add a bit of Photo-Flo (it's a wetting agent) and hang the
film up to dry again.

I can't see the marks on the web site, so I'm assuming either they are
*really* small or you've only picked the shots without them.

regards,

roland
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Roland B. Roberts, PhD                             RL Enterprises
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