David, this sounds like bad news. The mechanical aperture coupling on your PZ-1p appears to have shifted. Exposure should be affected with all manual lenses. However, it should expose correctly with F/FA lenses, as these transmit indeed the aperture value as part of the digital protocol.
Servus, Alin DAM> Anyway, when using manual focus lenses I find that the aperture readout DAM> on the body rarely matches the setting. Its usually 1/2-stop out, so DAM> f/4.5 will read as f/5.6. DAM> Today I noticed that the Z-1p consistentlly reports the correct aperture DAM> setting with FA lenses. So does the lens actually communicate this DAM> information to the body electronically? - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .

