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05-02-2014, 05:19 PM   #1
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Clunky Tokina 400mm

This oldie is a new acquisition. When it focuses right down it makes quite a clunk. Doesn't sound right. Can anyone provide an insight?

Does it with both the K100D and K-3. I'm concerned about damaging the camera.

05-02-2014, 05:26 PM   #2
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If you mean the AT-X AF400, I have that lens and mine has always done that - been that way for years. I wouldn't worry about it.
05-02-2014, 09:06 PM   #3
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Thanks dhhombert. Yes, it's the AT-X SD autofocus.
05-07-2014, 04:49 PM   #4
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Is it at minimum or maximum focusing distance? If this is happening at infinity, it could be that the stop is set just short of infinity and the lens is slamming into the stop before it actually hits focus. This can be remedied by adjusting the lens to focus slightly past infinity, so it comes to a graceful stop when focusing out. On the minimum side, there is not much that can be done about it, since you are going to bottom out at some point no matter what.


Last edited by dcshooter; 05-08-2014 at 05:17 AM. Reason: typos
05-08-2014, 01:48 AM   #5
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Thanks dcshooter. The clunk happens at the inward focus extreme.
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