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04-19-2021, 08:15 PM   #1
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HD Pentax-D FA 24-70mm F2.8 barrel wobble?

I just received a used HD Pentax-D FA 24-70mm F2.8 that appears to be in excellent condition. However, there's a bit of play between the zoom ring and the lens barrel throughout the zoom range except at 70mm. Not a huge amount of movement but it does rattle a bit. Can anyone tell me if this is normal or anything to be concerned about?

Thanks in advance,
Peterman

04-19-2021, 09:23 PM   #2
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If you can rock the front back and forth I would worry. What you are describing probably not so much, but info from an owner is more reassuring.
04-20-2021, 12:11 AM   #3
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Hi , I also just received an used DFA 24-70.
It is a very fine lens indeed , a bit heavy and large for my liking , but...
It has an external zoom so obviously there is some "wobble" present but it is not really noticeable , it is much smoother than , for example , on the DA* 60-250.
I can not notice any diference between 70 and other zoom range positions.
If I compare it with the DA* 11-18 ( an absolute marvel of the engineering ) , of course there will be the noticeable diference, the DA* has internal zoom and focus.
04-20-2021, 12:18 AM   #4
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As far as I know, some woobling is normal for external zoom lenses. If itís too much, you will probably notice it in the focus of the photos.

04-20-2021, 06:22 AM   #5
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QuoteOriginally posted by Michail_P Quote
As far as I know, some woobling is normal for external zoom lenses. If itís too much, you will probably notice it in the focus of the photos.
The front will rock back and forth just a bit. Would be difficult to measure (1/2 mm or less) but you can see it. Enough movement that it will be audible walking around with it mounted. Fully extended at 70mm the wobble is pretty much gone, which is the opposite of what I'd expect.
For reference, my 60-250 is tight throughout the zoom range. However, my DA* 16-50 does have a bit of play in the barrel and even my DA 12-24 wobbles just a bit. I never noticed the play in either of those until I checked them out for comparison. ��
So...since the 24-70 is a Tamron design, perhaps the tolerances are not as tight as a Pentax Star lens? I'm concerned that decentering could be an issue, so I will take some test shots to evaluate.
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