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Help. Is this normal for the DA 18-135?

Started Dec 30, 2012 | Discussions thread
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Help. Is this normal for the DA 18-135?
Dec 30, 2012

I just acquired a used DA 18-135 and noticed right away that after zooming it is necessary to refocus. If so, this is not a true "zoom" lens, but a "vary-focal" lens. I have a Katz-eye split image focusing screen so the focus change is very obvious as I zoom.

Is this within design specs, or should I return it?

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Jonathan Blocher
Instructor of Art, Design, and Humanities

 mr_blocher's gear list:mr_blocher's gear list
Pentax K-5 Pentax smc DA 55-300mm F4.0-5.8 ED Pentax smc D-FA 50mm F2.8 Macro Pentax smc DA 35mm F2.8 Macro Limited Pentax smc DA 18-135mm F3.5-5.6ED AL [IF] DC WR
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