Originally posted by clickclick If you can possibly save up for the PLM version, do so. I have both, and the focus speed is night and day, and you say you want to shoot sports. Get the PLM version. . . .
Fly in the ointment time folks
according to the OP's profile, he has:
" K20D, K100D Super, K-01, Q, Pentax Film SLRs "
the PLM version of that lens is not recommended
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*This lens uses an electric focus-by-wire system and will not focus (even manually) on cameras older than the Pentax K100D super (2006).
**Because the aperture is controlled electronically, this lens can only stop down when used with compatible cameras. The Pentax K-50, K-S1, K-S2, K-3, K-3 II, and K-1 are supported via a camera firmware update; the Pentax K-70, Pentax KP and all 2017 or newer bodies will work out of the box. The aperture diaphragm will always remain wide-open on unsupported bodies.
In an nutshell, this lens fully compatible with recent DSLRs but shouldn't be used on older bodies or film cameras.
Read more at:
HD Pentax-DA 55-300mm F4.5-6.3 PLM WR RE Review - Specifications | PentaxForums.com Reviews
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Pentax Lens Compatibility Chart
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Pentax bayonet lenses labeled "SMC Pentax" are referred to as "K" lenses in the table below. Other Pentax bayonet lenses have the lens designation as a part of their name as in "SMC Pentax-FA".
Note that "star" lenses work like their "non-star" counterparts unless they are singled out in the table below. So for compatibility of a DA* lens, look under DA lenses, etc.
Exceptions: FA and F "soft" lenses behave like M lenses in terms of metering. . . .
The Pentax Camera Lens Compatibility Chart