Re: [OM] Black and white portraits

[HI100]

Acer wrote:
               << You can also do what George did: get a Wratten gel filter 
and place it
 on the film rails. No light loss to the eye. >>

     I seem to remember George's post dealt with IR where exposure requires a 
fair bit of trial and error? In any case he probably used manual exposure. I 
don't remember whether he discussed this issue for OTF auto : but with the 
b/w  film and using OTF exposure the filter on the rails operates twice for 
the exposure measurement (at least at shutter speeds <1/60) but only once for 
the film. This means you must dial in a filter correction to increase film 
speed to make up for added light attenuation. Having to do this is a big 
nuisiance as you then must check that the shutter speed is <1/60. (At high 
shutter speeds the filter is in measurement only once! ) If you use the 
filter up front on the lens everything is taken care of automatically at all 
speeds. 

Tim Hughes
Hi100@xxxxxxx

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