Introductory bio from a 70mm IR photographer

["Rolland Elliott" <rolland_elliott@xxxxxxxxxxx>]

>>The first is the problem  of the one large and several small circles on 
>>the RB pressure plate, which I  rarely see on the negatives but which 
>>lately have ruined one too many otherwise  great photographs. I've read on 
>>WJ's web site about using various types to tape  to cover the plate, but I 
>>worry that this changes the focal plane of the film. I  almost always work 
>>with 90-127mm lenses at f11 or 16; do I need to worry about  the change in 
>>the film position after I cover the plate? In which direction (if  at all) 
>>does this shift the point of sharp focus on my subjects? And what would  
>>be the best material (tape, paint, ???) to use to cover the circles in the 
>>  plate?    The second technical puzzle I'm facing is that having to take 
>>the 87C filter on  and off the camera while photographing a model is very 
>>cumbersome and often  distracting to both of us. Has anyone tried 
>>inserting a gelatin filter (or one  of WJ's polyester filters) into the 
>>cavity in the body near the back, behind the  mirror? Are either of those 
>>filters sturdy enough that they could be inserted  and removed repeatedly, 
>>or should I dedicate an RB body to infrared?    >>

If you shoot at f/11 to f/16 I wouldn't worry about focus shift problems.  
The best material is Aluminum foil if you like halation of the film and if 
you want a more subdued look, 120 backing paper.

I've never tried mounting a gelatin filter in a RB67, but just mounted an 
opque UV filter in the back of a Nikon N90s. Due to the complexity of the 
mirror shutter mechanics this is not a task for the weak of heart. For any 
35mm autofocus camera it will most likely require modification of the sub 
mirror AF assembly.

-Rolland Elliott
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