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02-21-2013, 08:13 PM   #1
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Lens mount wobble (rotation) on K5

I just bought a Sigma 120-400mm lens, and noticed that when the lens is mounted the lens body rotates a little on my K5 - as if the mount was loose.

Not sure if this is the lens or the camera. Tried my Sigma 28-70mm DF (also heavy, but not like the 120-400) as well and I can feel a similar thing, but not as obvious. I haven't tried any other lenses yet. Maybe its because the 120-400 is such a heavy large diameter lens.

My old Canon T70 used to do something like this until I tightened the screws holding the bayonet on the camera body.
Could this be the same sort of problem? Has anyone else experience this? Am I being paranoid?

02-21-2013, 08:21 PM   #2
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With non-WR lenses it's normal to observe a very slight wobble. The reason it isn't there with WR lenses is that the weather seal adds quite a bit of friction, which prevents the lens from moving at all.

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02-22-2013, 10:40 PM   #3
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QuoteOriginally posted by Adam Quote
With non-WR lenses it's normal to observe a very slight wobble. The reason it isn't there with WR lenses is that the weather seal adds quite a bit of friction, which prevents the lens from moving at all.
Thanks Adam
05-18-2013, 07:02 PM   #4
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I noticed this as well on my new K5 IIs with the DA* 60-250 mounted. It is a larger heavier lens too. A little disconcerting.

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