I think it will be beneficial to have a list of AF speeds experienced with the multitude of Pentax AF lenses out there.
So pls help to contribute your experiences.
I'd suggest the following format and I'll try to update the list on Pg1 and 2 of this thread.
A - AF in Bright conditions (eg. ISO100; >=1/100; f4-f16)
B - AF in reasonably bright conditions (eg. ISO100-800; >=1/50; f2.8-4)
C - AF in dim lighting (eg. ISO3200-6400; =<1/50; =<f2.8)
Possible results = Good / Reasonable / Bad
where
Good = focuses within =< 0.5s
Reasonable = focuses within =< 1s or able to focus where any other DSLR/MILc would have struggled similarly (state compared to camera)
Bad = Focus with >2s or Fails to focus or much slower compared to another DSLR/MILC (state compared to camera)
Lens / A / B / C / Compared to / Remarks
Eg.
18-55 (from 18-50mm) / Good / Good / Bad / Kx PDAF / No remarks
18-55 (from 50-55mm) / Bad / Bad / Bad / Kx PDAF / No remarks
Update :
=========
Credits to JinDesu, dickymastelero, JPT, monochrome on PF for their contributions
Credits to ranchy, chiangkxv on CS for their contributions
DA lenses
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DA 18-55 WR - Reasonable before 45mm; slow from 45-55mm, all conditions
DAL 18-55 - Good, all conditions (need more inputs as result is different from WR version)
DA 18-135 Good, well lit
DA 16-45 Reasonable, well lit
DA 50-200 WR - Reasonable from 20-135mm, Reasonable but hunts a bit at 135mm; Slow at 200mm and need AF light, dim lit room
DA 55-300 - Reasonable on short end/ poor on long end, poor cycling, well lit
DA 10-17mm fisheye - Reasonable from 10-14mm; Focus ability weak at 17mm; dim lit room
DA14mm F2.8 - Good, reasonably fast cycle, Decent lighting condition
DA35mm F2.4 - Good, reasonably fast cycle, Decent lighting condition
DA 40XS f2.8 - Reasonable, all conditions
DFA 100WR - Slow but reasonable, can be overcome Quickshift, with all conditions
DA*50-135mm 2.8 - Slow (but reasonable for CDAF), well lit condition
DA*300 F4 - Reasonable, cycle time is slow, lighting condition (unknown- assume good)
DA*200 F2.8 - Good, cycle time is fast, lighting condition (unknown- assume good)
DA*16-50 F2.8 - Good, cycle time is fast, lighting condition (unknown- assume good)
DA 15ltd - Reasonable, all conditions
DA 21ltd - Reasonable, all conditions
DA 40ltd - Reasonable, all conditions
DA 70ltd - Reasonable, all conditions
FA lenses
---------------
F 35~70 - Good on all FL in bright out/indoor consitions, Reasonable in natural dim indoor lighting
F70~210 - Good on all FL in bright out/indoor consitions, 70-180mm Reasonable in natural dim indoor lighting, 210mm Poor in natural dim indoor lighting
FA 24-90 - Good in well lit conditions, reasonable in low light, this one is quite good at the long end
FA 100-300 (f4.7-5.8 non-powerzoom) - bad even in good light, long focus throw, can take a few seconds if it decides to go the wrong way
FA35 f2 - good, all conditions
F 35-70 - good in well lit conditions, reasonable in low light, a bit worse at the long end
FA 50mm 1.4 - Good, reasonably fast cycle, Decent lighting condition
FA*24mm f2 - Fast, hitting hard sound when lens focuses to the extreme end (need 2nd/3rd confirmation)
FA*85mm f1.4 - Reasonable but slower than K5, all conditions
FA*200 f2.8 - Slow, dim condition.
FA31ltd - Reasonable, dim condition
3rd Party Lenses
--------------------------
Sigma 10-20 - good, all conditions
Sigma 28-80 - Good, all conditions
Sigma 30 F1.4 - Good, all conditions
Sigma 70-200 HSM - Bad, well lit
Sigma 18-250 HSM - Bad, well lit
Tamron 17-50 f2.8 - Reasonable at all ends. Much better than DA18-55WR, all conditions
Tamron 70-200mm F2.8 - Slow (but reasonable for CDAF), well lit condition
Last edited by pinholecam; 04-07-2012 at 05:02 PM.