I think this inconsistancy might have to do with the PZ-1p's metering
compatibility with A lenses. I think it just affects Matrix metering so
turn it off and see what you get.
BTW, comparing my Sears F1.7 (same as Ricoh), and Pentax A F1.4 and M F2,
the Sears is about 1/2 stop slower on both the ZX-M and a Ricoh body. The
ME doesn't show half stops so I can't tell if it's present there. I have
thought this is either because the Ricoh engineers were a tad optomistic,
or maybe just more light gets through because of the SMC on the Pentax glass.
Todd
>
>One interesting by product of this test was the observation of metering
>differences between the Rikenon and the SMC-A. Basically, the Pentax lens
>seemed to be a little less than a half stop faster, in terms of shutter
>speed, at equivalent aperture settings. So, with both set to f8 the
>Rikenon might meter at 1/90 while the SMC-A metered at 1/125. This
>prompted me to compare all of my lenses that cover the 50mm range. To my
>surprise, my three Ricoh 50mm's (1.2, 1.4, and 1.7) showed this speed
>discrepancy on Pentax bodies. However, on a Ricoh body they metered
>identically to the Pentax 50mm's. This suggests a slight (repeat: slight)
>incompatibility between Ricoh lenses and Pentax bodies. It's hard to tell
>how far off they are - certainly no more than a half stop. But, the net
>result is that wide open, the SMC-A 50mm f1.4 and Rikenon 55mm f1.2 metered
>identically in most situations -- undermining the advantage of the
>'faster' Rikenon 55mm f1.2!
>
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