Cant you guys read my posts before you make such comments about me? I have explained repeatedly its not just the issue or K/M lenses on an istD here that concerns me its Pentax turning point decision to no longer support something without technical or financial CAUSE. Its ridiculous that a camera as sophisticated as the istD doesn't properly meter with K/M lenses because of a $5 part's removal for strategic not photographic or compatability reasons. This situation is ONLY THE START of something bad because they absolutely had a firm policy for deacdes to NOT do that kind of thing and now they suddenly have done a 180 apparently to sell more blades for their razors..
Secondly while its true stop down metering CAN BE more accurate in sufficient light but if the tolerances of the lens apertures are kept within design parameters and the cam sensor as well , the wide open metering can work with more than enough accuracy for even narrow latitude slide films. That is why the entire photo industry abandoned stop down metering about 30 years ago. Think about this if stop down meter is "better" than why doesn't the camera stop down meter with A, F, and FA lenses too with no open aperture option? Sorry but to me that pretty much proves that the very slight possible benefit of stop down metering is trounce by the convienence and extended metering range of open aperture metering AND a true AE mode. Lastly, stop down metering is now and has always been possible since the switch to open aperture metering. There is nothing making both methods possible on the same body so by saying stop down metering might be more accurate under bright light conditions doesn't mean open aperture meter has to or should be deleted. JCO -----Original Message----- From: Mark Erickson [mailto:[EMAIL PROTECTED] Sent: Sunday, September 18, 2005 7:05 PM To: 'pentax-discuss' Subject: green button wars (again) My take: J.C. is right when he says that K/M lenses are not "fully supported" by Pentax DSLRs. This is because "green-button metering" takes the meter reading when the lens is stopped down. Open aperture metering takes the meter reading with the lens wide open. "Green-button metering" takes in less light than open aperture metering. If you try to use "green-button metering" in low light with a small lens aperture, you might run out of the useful range of the meter. On the other hand, "green-button metering"(also known as stop-down metering) may be more accurate than open-aperture metering because it takes the meter reading with the lens at the same aperture as will be used to actually take the picture. In addition, if you're shooting at or near wide open or in good light, the meter sensitivity issue is not likely to be a problem. A number of Pentax digital SLR users (includig myself) appear to be satisfied with the performance of "green-button metering". I personally find it easy to use and haven't had low-light metering problems since I typically shoot low-light images at or near wide-open anyway. J.C. seems to be very unhappy with "green-button metering". J.C. also seems to object to others' satisfaction with "green-button metering". I don't have a problem with J.C.'s dissatisfaction with "green-button metering", but I do find his objections to others' opinions annoying. Have a nice day. I'm going to go take some more pictures of my new daughter.... --Mark
