"J. C. O'Connell" <[EMAIL PROTECTED]> wrote: >> Maybe I don't understand this . . . >> >> As I understood it, the old K mount lenses would work fine with a new >> APS sensor with a 1.5 or so factor. > >They would work, but I'm not so sure about "fine". I think >that lenses designed strictly for a smaller image circle >would have higher resolution than one's designed to >cover the 43mm diagonal of a full 35mm frame. > >This in already occuring with Pentax Lenses. Their 6X7 >lenses are not as sharp as their 35mm lenses, even if >you only use the central portion of the 6X7 lenses.
Exactly. I've done the math on this and posted it before: Making a 10 x 15 inch print from a shot taken with a 100 lpm lens would yield a final (print) resolution of 9.45 lpm if that lens were used on a Canon EOS-1Ds, but if that same lens were used on a D-60 the final print would have a resolution of 5.97 lpm. Using 100 lpm lens: Camera Mult CCD H, W, Diag Horiz. Res. 15" Print ------------ ---- ---------------- ------------ --------- Canon EOS-1Ds 1x 24 36 43 3600 (100%) 9.45 lpm Canon EOS-1D 1.3x 17.8 27 32 2700 (75%) 7.08 lpm Nikon D100 1.5x 15.6 23.7 28 2370 (66%) 6.23 lpm Canon D60 1.6x 15.1 22.7 27 2270 (63%) 5.97 lpm Sigma SD9 1.7x 13.8 20.7 25 2070 (58%) 5.43 lpm For a given focal length "multiplication factor" you can *divide* the effective resolution by the same number. Makes the math easy. >10 yrs? No way. Kodak has just released a $4K SLR with >14Mp and a 35mm size sensor. $1K SLR with same specs should only take a few >years, maybe 5 at the most. Perhaps 5-6 years to his the $1000 price point. Right now the hot sellers in the DSLR market are around $2000. I'd give two years for full-frame to get there. -- Mark Roberts Photography and writing www.robertstech.com
