Author Topic: 'Probelm' with lens mount?  (Read 1860 times)

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Offline Fixxxer

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'Probelm' with lens mount?
« on: February 14, 2009, 08:32:29 PM »
Evening all,

I've just noticed what might be a potential problem with my lens mount (hence posting here; as opposed to a350 section).

When I grip the lens at the base, whilst it's mounted (I mean the part closest to the body), on any part that is fixed (i.e. not the focusing or magnification rings) it seems to have a little give in it - as if the lens were turning to come off the camera. It doesn't actually come off, of course, without releasing the lock, but there is a tiny bit of rotating movement there - I can move the lens a fraction of a mm - I can't really see it moving, but it makes a noise and I can feel a tiny bit of rotation. I don't remember it doing this previously; but since turning the lens itself whilst locked isn't something I find myself doing, really (!), it's enough to make me worried - afterall, the end of my warranty is approaching and I don't want to pay for repairs.

I had a quick look to check whether there was something wrong with the locking mechanism - I rarely have a lens off my camera, so staring into its innards is again something I infrequently do - but I noticed that the pin sticking out from the body at the 5 o clock position can be pushed up and down (not in and out, which obviously it needs to do) very gently.

I'd be grateful if anyone knows whether this is meant to be happening, or can check themselves - I wouldn't be surprised if I'm worrying about nothing but I've got to the stage where I'm terrified of finding problems after the warranty expires.

Oh yeah, I have an a350 - but I doubt it's specific, since the alpha mount is identical across the range..

Thanks

Dan
« Last Edit: February 14, 2009, 09:17:54 PM by Fixxxer »

Offline billions

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Re: 'Probelm' with lens mount?
« Reply #1 on: February 14, 2009, 08:43:46 PM »
have a350 with same micro-rotation. I thought it was a natural thing? am using kit-lens.

(ps: when I'm autofocusing in closeup my lens seems to jump left and right... do not think that is a good thing)

Offline Fixxxer

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Re: 'Probelm' with lens mount?
« Reply #2 on: February 14, 2009, 09:06:40 PM »
I too have the kit lens on, but I get the same problem with my Sigma 70-300.

But it's good to hear that this isn't exclusive to my camera (in a weird, twisted way - since I wish no ill upon your fine camera sir!). But, as I said - I have a tendancy to get overly worried about problems with anything when the end of warranty looms upon the horizon..

Offline sonyboy

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Re: 'Probelm' with lens mount?
« Reply #3 on: February 14, 2009, 09:32:36 PM »
Hi All
I also have a very slight rotation with all my lenses on the a700, i also had it with the same lenses on my A100 have always assumed that it was inherent in the design of the mounting system.

Regards
Rick
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Offline Rob aka [minolta mad]

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Re: 'Probelm' with lens mount?
« Reply #4 on: February 14, 2009, 09:37:29 PM »
There was a thread a while ago about this (think it was DrTheo when he first got his A700 !)
All camera's will have the movement that you describe, and appears to be more noticeable with heavier lenses.
As long as it is only a fraction of a mm as you describe then thats normal.


Rob

Offline Fixxxer

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Re: 'Probelm' with lens mount?
« Reply #5 on: February 15, 2009, 12:30:18 AM »
Thanks for the help everyone - I think I've established quite enough why I was worried; but its good to hear it's normal.