Re: Exposure (was: Rangefinder etc)

[George L Smyth <GLSmyth@xxxxxxx>]

Willem-Jan Markerink wrote:
> 
> But I noticed from at least one bio that a 87B user is among
> us....perhaps you could tell us the typical exposure for this filter?
> Would be very convenient if one could just add another stop, so +6
> for 87B, and +7 for 87A. But the curve of the film's sensitivity
> should tell me otherwise....it wouldn't surprise me if it is +8 and
> +10....
> 
> BTW, anyone numbers on Konica with darker filters than #25?
> I once read that for practical purposes (read: not yet bulb setting)
> #89B was the darkest usable color; but I also read about using #87,
> ending up with fractions of ASA....;-))

I've used a Hoya R72 filter with Kodak, Ilford, and Konica films.  I'm
in the middle of testing, but I'm initially finding that 3 stops of
additional exposure is required.

george

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