Tiny cameras for infrared

[Joe Berenbaum <joe-b@xxxxxxxxxxxx>]

I'm thinking of putting a dark red filter inside a pocketable compact camera
for use with Kodak High Speed Infrared. When I say pocketable I mean really
tiny. I already use a Rollei 35 for this with a filter on the lens but it is
still quite a lump and won't go in a trouser pocket comfortably. I mostly
use this combination for Infrared Ektachrome since that's the infrared film
I use mostly- but that may change. I'm looking at the very small compacts
such as the Olympus XA, XA4, and the Minox 35ML, but all of these have
visibly dimpled pressure plates. But then so does the Rollei 35, and I
haven't had a problem with that yet. Maybe I need to look again at those
pictures! So two questions; 
1] Has anyone used the Rollei 35/35S for High-Speed Infrared? And if so,
does the lightly dimpled pressure plate ever cause a problem with this film?
2] Can anyone state what degree of dimpling (on a pressure plate) causes
problems with High-Speed Infrared- or does any degree of dimpling at all
cause a problem?
And one other questionm, while I'm here-
3] Do behind the lens filters (ie in front of the film plane- just) cause
any focus shift or focus error, and if so, is this more likely or less
likely with wideangle lenses?

Joe B.


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