Re: Filters between film rails

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

On  6 Jul 97 at 10:40, Chris Gibbs wrote:

> The talk about placing an IR filter beween the film rails got me
> thinking.  As a medium format shooter, placing the filter in the film
> back seemed (initially) like a viable alternative!
> 
> First thoughts where along the lines of being able to view/focus the
> camera with a filter in-place....then my thoughts turned to dust &
> hairs!!!!
> 
> Surely a filter so close to the film plane would be a real problem with
> regards to dust & hairs!  Unlike filters infront of the lens filters so
> close to the film plane would IMHO be extremely problematic!
> 
> You thoughts on the issue.....

I have not had problems in this field yet, and I have loaded my EOS-1 
in quite stressy circumstances, loading in a changing bag on a ski 
slope, in very dry & cold weather.
Medium format seems a bit more difficult in general by the lack of a
good mounting point for the filter close to the film. Though they 
also offer more room behind the mirror, for those without film plane 
shutter that is.

Also: when using Konica with an opaque filter, you are almost 
certainly doomed to using a tripod anyway because of effective film 
speed. The 'sunny-sixteen' rule says that you are getting close to 1s 
@ f16....
Yet it still might be useful for (extreme) wide angles, and of course 
it will still be convenient even on a tripod....but less necessary as 
when hand holding.




 

- -- 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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End of Infrared-Digest V0 #109
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