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04-02-2011, 03:51 PM   #1
Senior Member

Join Date: Apr 2010
Location: Sanski Most
Posts: 148
weird focusing with one particular lens

I have one copy of fa35, is sharp and good outside condition lens, and on old K-m this lens work without flaws, but on K-5 with last firmware 1.03 lens in low light, when is not dark, just lights are dim, lens try to focus and go to shortest focus distance and when go forward they stuck somewhere around 0,5 meter then go forward-back, forward-back countless times, until I release button and prefocus again, sometimes that repeat couple times before lens catch anything in focus somtimes i just giveup.
I tried lens on K-m and worked fine, than i manually prefocused to subject in dim light and try AF, after that lens just move focus back to shortest position and stuck again i 30cm - 50 cm focus place acording to scale on lens , and go back-forward, back - forward in loop.
So this is not normal, and my question is, is this described K-5 low light "feature" or is something what occur only with my lens?

and one more thing, i keep AF on AF.S, sometimes camera give beep to achieve focus and than continue to search focus.
In sunny day there is no any problem.

04-02-2011, 09:16 PM   #2
Wheatfield's Avatar

Join Date: Apr 2008
Location: The wheatfields of Canada
Posts: 12,336
This actually sounds surprisingly normal for the K5. In some light level/light colour combinations, it does remarkably poorly.
Or so I've been told.
I've been fortunate that I haven't run into it yet.

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