Originally posted by Marc Sabatella All Pentax DSLR's have essentially the same exposure system, although there always reports of one being more or less consistent than another. but they do basically the same things - multi-segment exposure system, a center-weighted mode, and a spot metering mode, all of which work according to standard photographic principles (aiming for results little dark than an 18% gray card on average).
Marc
I would agree, but I guess the real question is, does the K20D behave the same as the K10D with manual apature lenses.
I know, from the thread I attached, there is some concern over metering if the camera does not know the actual maximum apature of the lens.
In the K10D it is quite specific in behavior, and seems to be related to the actual focusing screen installed, as replacing the K10D screen with that of an *istD corrected the manual apature metering problem, but then introduced an error based only on maximum lens apature. This same error exists when putting a TC on the camera that does not change the apature settings, but only passes them through.
It has been reported that the K20D has the same focusing screen as the K10D, therefore one could suppose it would share the same problem with manual apature lenses, but that is only supposition on my part, as I don't have a K20D.
Fortunately for most people, they use newer lenses, and with lenses that report the maximum apature to the body, the K10D (and by inference the K20D) meter very well. The only problems I have encountered are not with the camera, but that some lenses seem to have a slightly increasing error in apature (not stopping down quite enough) at small apatures leading to a drift from correct exposure to + 1/2 stop. But in all cases where I have seen this, I can definitely track it down to the lens