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04-06-2016, 07:26 PM   #1
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Question about zoom on SMC-F 70~210mm f/4-5.6 Lens

Just received nice looking used copy of this lens and (not mounted) I could not budge it from 70mm FL, later when I mounted it on my K20d with a moderate force it moved and after that it acts normally.

Any opinion if this is odd/something suggestive of a mechanical problem?

I only have two other pentax zooms--and the only one remotely comparable is the FA 28~70 f/4, and I never had anything similar.

04-06-2016, 07:30 PM   #2
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It can be a stiff lens but don't remember it being that stiff, and we have had it since 1989
04-06-2016, 10:07 PM   #3
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Holding mine in hand right now. Got it originally as new in my SF-1 kit along with the 35-70 (love that lens) back in the '80's. My copy is smooth in all respects. A little internal dust. Nice resistance through the zoom range. A little tighter coming off the long and short ends but nothing major.
04-07-2016, 02:09 PM   #4
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Pentax F 70-200

I bought one years ago that was quite stiff to zoom. I thought maybe mine was a bad copy. It also had some minor issues with the coatings, but still it was very sharp.

04-08-2016, 04:27 AM   #5
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I have one of these lenses, and mine exhibits sort of the opposite: zoom is very easy from about 70-80mm, then quite stiff from 80-210. Still can zoom without too much difficulty though.

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