Re: Fwd: 4X5 infra-red photography

[Clive Warren <Clive.Warren@xxxxxxxxxxxxxx>]

At 9:05 pm +0100 24/7/00, Gavin Wrigley wrote:

>Any suggestions??
>
>TIA
>Gavin
>
>
>---------------- Begin Forwarded Message ----------------
>Date:        21/7/00 3:22 pm
>Received:    21/7/00 6:01 pm
>
>I'm experienced with infra-red and 35mm photography, but recently I've
>tried it with 4X5 and the Kodak film.  I'm having problems with film
>fogging that I've narrowed down to the film holders.  The Toyo film
>holders fog the film even though Toyo (via their website told me it
>should be OK).  I've had mixed results with the old Grafmatic.  It seems
>that it leaks through the seals.  Sometimes I get a good negative
>sometimes not.  So my question is Do you know of a film holder that is
>guaranteed not to leak infra-red?  I greatly appreciate any leads you can
>give me.  Thanks
>

Gavin,

There is a section in the Infrared FAQ (URL in sig. file) on using 4x5 film
holders and Grafmatics.  See Section 7. Which cameras?   Using 4"x 5"
Cameras.

Generally it is a good idea to renew light seals before using film holders
for infrared. I also suggest keeping the end of the darkslide in the holder
during exposures to minimise the possibility of light leaks.

Grafmatics are fine as long as the light seals around the darkslide are in
good shape.  The darkslides are metal so do not pass infrared light.


All the best,

             Clive   http://www.cocam.co.uk
                     Photographic Services, Filters and Equipment, Infrared FAQ


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