RE: 4X5 infra-red photography

[Jason Revell <jason.revell@xxxxxxxxx>]

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.

Jason Revell
Jason.revell@xxxxxxxxx <mailto:Jason.revell@xxxxxxxxx> 


		-----Original Message-----
		From:	Gavin Wrigley [mailto:minty@xxxxxxxxxxxxx]
		Sent:	24 July 2000 21:06
		To:	Infrared
		Subject:	Fwd: 4X5 infra-red photography

		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


		----------------- End Forwarded Message -----------------

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