gelatin filters

[Stephen R. Lasky, Ph.D.]

In article <ANITA.94Nov20214205 at accord.cco.caltech.edu>,
anita at accord.cco.caltech.edu (Anita Gould) wrote:
> 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.
> 
>    -Paul.
> 
> 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 Gould
>                                     anita at cco.caltech.edu

We are using a non-gelatin filter that screws onto the filter threads on
the camera lens.  It is a Tiffen 40.5 mm 15 Deep Yellow filter.  It's made
of glass and doesn't scratch or warp when wet . I highly recommend it. I
think that I got it from IBI or maybe it was from Fotodyne, I don't
remember anymore.

SRLasky

-- 
*********************************************************************Stephen R. Lasky, Ph.D.
Roger Williams Medical Center/Brown University
Phone: 401-456-6572       Fax: 401-456-6569       e-mail: Stephen_Lasky at brown.edu
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