anita at accord.cco.caltech.edu
Mon Nov 21 00:42:05 EST 1994
In article <9411181801.AA06074 at fcs260c2.ncifcrf.gov> pnh at ncifcrf.gov writes:
Al McGraw (mcgraw at BSCR.UGA.EDU) wrote:
| I wonder if filters for regular EtBr-UV photography are available at a
| similarly low price from a camera shop. Our camera rig has two filters
| in it - I'm not sure what they are - but they're so old scratched and
| smudged that image quality suffers. Any suggestions? Paul?
Yes. They are Kodak Wratten Gelatin filter No. 2B and No. 23A.
I hate to tell you this: I was just in the camera shop a few days ago
& thought I would replace our similarly scratched filters, but the
salesperson told me that Kodak doesn't make a 23A or 22A any more. He
seemed to know what he was talking about, & looked it up in the
catalog as well. He wasn't able to tell me what I should use instead
-- any ideas? I didn't want to just match the color of the filter by
eye, since I know that different spectral band-pass properties can
give the same visible color.
anita at cco.caltech.edu
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