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11-19-2009, 01:35 PM   #16
Pentaxian




Join Date: Feb 2009
Location: Alameda, CA
Posts: 3,198
QuoteOriginally posted by philbaum Quote
I have no doubt in normal daytime lighting that this combo would focus on SDM.
My combo of Tamron 1.4X TC + DA* 50-135 autofocuses OK if the lens is set at 50mm. At 135mm, it hunts back and forth as if the focus can't decide where to lock. Then if I lift my finger from the shutter release button, and half-press again, it will lock in focus.

The combo of Tamron 1.4X TC + DA* 60-250 behaves the same way.

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