RE: 4X5 infra-red photography

[Clive Warren <Clive.Warren@xxxxxxxxxxxxxx>]

At 10:19 am +0100 25/7/00, Jason Revell wrote:

>I use Toyo view darkslides here at work. Mainly they have 7 dot's, some have
>5 and the rest have none (I think these are quite old).
>
>To date the only reason why I have had any form of fogging on the film has
>been from the tape at the bottom of the holders.  After a while the cloth
>tape becomes very brittle and cracks form.  These do fog IR film but it's
>not really noticeable on other films.  The solution I use is Black Gaffer
>Tape (Duct tape in the States I believe)  this seams to hold them are much
>longer and I have not had a problem with IR leakage with one's repaired in
>this manner.

That's a good point Jason.  I am guessing that you do most of your 4x5 work
in the studio or equivalent settings (eg gallery). When outside in the wild
world, there is more likelyhood of light leaks from the darkslide end of
the holders in my experience. This is why I recommended leaving the tip of
the darkslide in the holder.

This can get a little too interesting if the wind picks up as the darkslide
starts acting as a sail.  Apart from the camera movement problems if the
darkslide stays put, there is also the danger of the darkslide falling out.
When you've set up next to a sheer drop of over a 1000 feet or so then it's
not just the possibility of dust on the darkslide that you have to think
about :-)  This happened to me at Schaefer Point, Canyonlands, Utah in
gusty wind.

After watching a couple of small accessories get blown over the drop about
two feet in front of me I changed to a roll film back. Will post the snap
shot of the camera set up at Schaefer Point in the travelogue on
http://www.f32.net when I get a spare moment.


All the best,

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


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