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10-08-2008, 06:06 AM   #31
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Join Date: Jul 2007
Location: Oaxaca, Mexico
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Some of my Pentax lenses seem to get a focus lock easily and others simply don't. Don't know why. As to using the flash assist, a couple of days ago I was shooting a puppet show at ten in the morning and was forty feet away. I couldn't get a focus lock. The flash assist wouldn't have done anything.I switched to manual focus. Since that morning, if the 24-90 is on the camera I have it in manual focus.

10-08-2008, 07:49 AM   #32
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Join Date: Dec 2006
Location: Outside of Philly
Posts: 1,564
Patrick - I believe some lenses have problems autofocusing because they have low contrast wide open (and we all know the AF-ing happens with the lens wide open). My FA 50mm f/1.4 was known to have low contrast at f/1.4, and it was much slower in autofocusing than my 35mm f/2 (in low light), and the AF system needs contrast to focus.

That's my theory at least....

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