Originally posted by Smeggypants Ok, been doing a lot of tests ... I will say there is some improvement, but the AF performance on my K-5 is still way behind the K20D. I'll post pictures tomorrow sometimes as it's 3:30an here, but here's the test I just did ....
K20D - Sigma 30/1.4 - exposure f1.4 1/60s ISO160 [apox EV6.5] tungsten light.
AF test chart focus spot on!
K-5 - Sigma 30/1.4 - exposure f1.4 1/60s ISO160 [apox EV6.5] tungsten light.
AF test chart focus spot on!
proves the above the two cameras perform equally well with the same lens and same settings at EV6.5
now taking the light down to EV2 ...
K20D - Sigma 30/1.4 - exposure f1.4 1/60s ISO3200 [approx EV2]
object in room - AF spot on
K-5 - Sigma 30/1.4 - exposure f1.4 1/60s ISO3200 [approx EV2]
object in room - phase AF way front focusses. contrast AF nails it.
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Current conclusion: My K20D focus works perfectly at EV2 in all situations i've tried. the K-5 AF has worked in some situations at EV2 but there's many situations including the test above where it has failed miserably.
A lot more testing required.
Smeggy,
A request:
My K20 will not hold DOF in low light (EV2) at f1.4 (FA 50) and probably not at 2.0 either. It is close at 2.8 and in at f4, no trouble at f5.6.
If the K5 would do at least as well as that, it would be ok for most indoor shots I would be shooting (well, except for the bounce issue).
Can you shoot a comparison or test at f4 EV 2 or so?
If that looks ok, I will probably re-order the K5 as it will work about as well as my K20 does.
I must say that the Contrast and PDAF shots in this thread are not at all encouraging, as they look just like the results I saw with my earlier K5 bodies.
Thanks,
Ray