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05-03-2011, 08:23 AM   #1
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Pentax DA 16-45mm - uneven zoom - is it normal?

Got my "new" used 16-45mm lens yesterday. Unfortunately had no time to try it out.

Using the zoom, there is fairly high friction from 45 to 28mm, and then very light friction the rest of the way to 16mm. Is that normal for this lens?

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05-03-2011, 08:27 AM   #2
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QuoteOriginally posted by HenrikDK Quote
Got my "new" used 16-45mm lens yesterday. Unfortunately had no time to try it out.

Using the zoom, there is fairly high friction from 45 to 28mm, and then very light friction the rest of the way to 16mm. Is that normal for this lens?

Thanks
I used to own the 16-45, and I recall the zoom wasn't perfectly smooth from end to end. Then again, not too many lenses are unless they are internal zoom lenses like the DA*50-135. Even expensive lenses like the 16-50 and 60-250 have a "bump" in the middle of the zoom range as the lens telescope out.

That said, whether your 16-45 is normal depends on how much friction we're talking about. Is it hard to move, or just harder compared to the lower end of the range?
05-03-2011, 08:51 AM   #3
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The first part (45 to 28mm) has about the same resistance or maybe slightly more than my 18-55 DA II (did not compare directly so based on memory). The second part (28mm to 16mm) has noticable less friction.

Not hard to move - just more friction than the lower part. Sounds like it is normal.
05-04-2011, 12:54 PM   #4
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I doubt it's a problem. My 16-45 feels uneven through the range. I'll bet it's because of the varying loads caused by the screws and cams which zoom the elements about.

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