Originally posted by Nowhere Matt I also think variations come into play but in my undocumented and limited experience there are some lenses that meter much better than others using stop down methods. I have a Sears lens that meters very poorly when closed down beyond f4 and a Lenmar lens that is slightly inaccurate beyond f11 while others such as a Focal, Quantaray and Pentax are generally good at all f stops.
These findings include the K10 and K-7 and may be considered "kooky talk".
once upon a time (1/t ?
) I proposed a little project, specifically people take a common lens like a K1.4 50mm and map out the green button exposure for different cameras, and different focusing screens. I have this for the*istD, K10D and K7, plus additional mappings of the K10D with an *istD screen and a split image screen.
It would be worthwhile.
I additionally suggested people put metering curves in the lens database when they do a review, therefore telling everyone else how the lenses meter.
unfortunately it never happened.