IR wide open (was: Kodak HIE & 4x5 Film Holders - Reply

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On 14 Dec 96 at 15:13, Scott Donkin wrote:

> Sure.  Most all lenses are like that.  But a 1/4 of one percent of the 2.7mm
> (50 minus 47.3) is so small that it shouldn't cause you a problem.  Either
> way, how many of us are shooting IR with the lens set wide open?

I do!....:-))
Not by choice though, but there is no other way when using a 200mm 
+ #87C on a ski slope....8-))
Note that this only works when mounting such a filter behind the 
mirror (in my case between the film rails). Any other position of the 
filter requires a tripod anyway.... 

PS: I discovered that not all camera's can take such a filter; some 
film rails are completely flush with the shutter opening, without any edge to 
make the setup light-tight.
My EOS-1 has a very thin edge there, about 0.25mm at most, but 
sufficient to make it work.

Would be interesting to hear about this for other brands and 
models....

 
--
Bye,

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      The desire to understand 
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<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]

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Topic No. 2