Re: Franks Bean Splitter

[michaelk@xxxxxxxxxxx (Michael Kersenbrock)]

> >... So one should 'be good' and keep to
> >the recommended fstop range (5.6 to 8 with the Pentax viewer).
> 
>   It is difficult to get the whole scene in focus given the limited
> range of allowable f stops and a 50 mm lens.  If you are very
> grain sensitive like I am you will find this to be a problem since
> the resulting out of focus areas make the grain more apparent.

Yes,  the limited range of f-stops is one of the major disadvantages.  50's
stereo cameras have limited shutter speeds, and wide fstop choices, while 
beamsplitters are the opposite with limited fstop choices and a wide range 
of shutter speeds.

I tend to use f5.6~f8 most of the time even with my realist format cameras. 
I find that if I try to follow the "rules" of 3D which want the subject's
range of depth restricted, f8 is adequate to keep that restricted subject 
range in focus.

But then, I don't always quite follow the rules.... :-)

Mike K.



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