For those interested, a while back Colorfoto magazine did a test on the AF
speeds for SLRs.
They measured AF speed, AF accuracy and AE accuracy. The rating
was based on all three tests. I was told that since the AF accuracy
was within the DOF for all tested cameras, the final rating is useless.
The interesting part was AF speed. They tested with a 50/1.4 lens.
This predates the EOS3 and 1v which would now be at the top.
The results in seconds at EV 15, 10, 5 and 0:
Nikon F5: 0.19, 0.19, 0.29, 0.41
Canon EOS-1n: 0.23, 0.23, 0.33, 0.51 (w or w/o booster)
Nikon F90X: 0.26, 0.26, 0.35, 0.53
Pentax Z-1p: 0.27, 0.29, 0.39, 0.58
Pentax MZ-5: 0.28, 0.31, 0.40, 0.61
Minolta 700si: 0.27, 0.32, 0.40, 0.60
Nikon F70: 0.30, 0.30, 0.39, 0.78
Canon EOS-5: 0.30, 0.34, 0.42, 0.60
Canon EOS-50: 0.33, 0.37, 0.43, 0.63
Minolta 500si: 0.40, 0.40, 0.45, 0.67
Contax AX: 0.39, 0.42, 0.50, 0.60 (back focus in body with
MF lens)
Canon EOS-500N: 0.45, 0.52, 0.49, 0.73
Minolta 300si: 0.47, 0.50, 0.53, 0.72
Nikon F50: 0.49, 0.50, 0.52, 0.75
Pentax MZ-50: 0.49, 0.49, 0.56, 0.79
Sigma SA-5: 0.56, 0.57, 0.61, 0.80
AE accuracy was within 1/3 stop for almost all cameras. Some low-end
cameras was biased towards overexposure that is best for print film.
Peter K
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