Archived posting to the Leica Users Group, 1996/06/21
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Yes, each lower speed doubles the quantity of light that hits the film, each
higher speed halves same. If you arrive to set the shutterspeed of a Leica-M
1/3 beyond a time value (which is pretty hard to do), you always cut the
same percent of light (33 1/3%), at any shutter speed, reducing the density
of the film by always the same quantity (forgetting the Schwarzschild effect).
Again, be careful: no accurate metering on a Leica-M between standard
exposure values. I prefer to go inbetween via the aperture.
Gerard Captijn,
Geneva, Switzerland.
- -------------------------------------------------------------------------------
>> You may use mechanical speeds between the standard increments (exepted 1/8
> -
>> 1/15) but don't count on accurate metering.
>>
>> Gerard Captijn,
>> Geneva, Switzerland.
>
>Is there a linear relationship between the twist of the knob and
>the exposure? If I manage to set the speed 1/3 of the turn between two
>speeds, the effect is 1/3 stops, is it?
>
> -Pasi
>
>
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