Pentax Zone V completely off

[Mark Sampson]

I'm a bit confused. Do you have a Pentax spot meter that has been modified by (the long-gone) Zone VI Studios? Those had filters added to more closely align the meter to the sensitivity of panchromatic film. In theory these mods let you "meter through the filter"; I used one for many years and it did work very well that way. Richard Ritter used to work for Zone VI, and as others have said, will be a fine choice to calibrate your meter, modified or not. www.lg4mat.net

[nolindan]

...Did a metering test with a grey card:
Digital camera ISO 100 and f16 as expected.
Pentax ISO 100 but 15,5 not 15 - 1/2 stop off.

For such disparate methods I would say the results are spot-on. Take some test shots and see if its all good now.