AF speed SWD vs. screw?

Started Jun 18, 2014 | Discussions thread
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Leandros S Senior Member • Posts: 1,838
AF speed SWD vs. screw?

In all the discussions about the limitations of Pentax' SWD driven lenses, I haven't gotten a clear idea of whether forcing them to work in screwdrive mode actually improves autofocus speed (which I suspect is the cause of the higher proportion of misfocused shots found in tests). Naively, I would expect that they would then operate at the same speeds typical of DA lenses - let's say the 60-250mm might work at speeds similar to the 50-200 or 55-300. I might be wrong...

Also, I understand that in the "consumer" DA SWD lenses (17-70,18-270), the screwdrive option is not available - is this correct?

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