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a7iii to FE 200-600mm lens rotational looseness


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First, it could be the camera OR the lens.

Do you have other lenses?  Do they also "wobble"?

You are talking about a 1mm movement.

All of my lenses move "a little" when on any of my cameras -- film or digital.

The digital cameras have electrical contacts that are 3mm wide -- more or less.  That's to make sure that the contacts are OK, despite a little movement.

Is it better, worse, or the same with other cameras or lenses?  Do a small experiment and let us know -- but a 1mm "shift" does not sound "bad" to me.

 

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If the 200-600 shows no movement on the video cameras, that would suggest the A7iii camera has the "problem".

If the 28-70 shows no movement on the A7iii camera, that would suggest the 200-600 lens has the "problem".

I'd suggest that the "problem" is normal, minor, variance between that particular lens and that particular camera.

I have lots of cameras and lots of lenses -- and some combinations are slightly tighter than others, and some are slightly looser.

If your results are good, just keep an eye on it -- and find something else to worry about.

 

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Interesting question. I wonder how many readers are now checking their lenses?

I have. As XKAES says, some combinations are slightly looser or tighter than others. No problem optically or with focussing etc.

One of mine (Sigma 170-500mm) is actually slightly loose at between the lens mount and the lens itself. I think a slight tightening of the screws is in order, but I need to get the appropriate screw driver. I think it is a Japanese one I need.

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Good point.  It is easy to check to determine if the lens mount on the camera or lens is loose, but that's never happened to me -- but I've never been struck by lightning, either!

But the fact that the camera is fine with other lenses, and the lens is fine with other cameras, suggests that it is a MINOR, mating-incompatibility, NON-issue.

Edited by XKAES
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  • 9 months later...

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i noticed today the same problema... after 6 month my 200 600,,,, when i shot horizontal everything is stable.... when shooting the moon in the sky at 200mm it moves alone (like collapse) to 300 mm.... rotational stability lost :(

i have done a video of the problem.... how did you solve it?

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On 1/16/2022 at 11:36 AM, Nicola said:

i noticed today the same problema... after 6 month my 200 600,,,, when i shot horizontal everything is stable.... when shooting the moon in the sky at 200mm it moves alone (like collapse) to 300 mm.... rotational stability lost :(

i have done a video of the problem.... how did you solve it?

The problem with your lens is not what the OP is describing.  Your problem is zoom creep which happens to many zoom lenses.  Zoom creep is quite common with push-pull zoom/focus ring found on many older legacy zoom lenses but I had thought a modern zoom lens with internal focus and zoom (lens' length remain constant) would not be susceptible zoom creep.  Can anyone confirm if the 200-600 lens is in fact an internal focus and zoom lens?

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12 hours ago, tadwil said:

Can anyone confirm if the 200-600 lens is in fact an internal focus and zoom lens?

It is. I had also suspected this lens to be totally unsusceptible to zoom creep. I guess the resistance of the zoom ring is so low that just the bare weight of the optical elements is enough to cause some creep, which is a real pity on a lens like this. Would have been nice if there was a knob to adjust friction of the zoom ring.

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13 hours ago, Pieter said:

It is. I had also suspected this lens to be totally unsusceptible to zoom creep. I guess the resistance of the zoom ring is so low that just the bare weight of the optical elements is enough to cause some creep, which is a real pity on a lens like this. Would have been nice if there was a knob to adjust friction of the zoom ring.

That's a shame.  I would have expected a modern lens with internal focus/zoom would have resolved the zoom creep issue.  In a previous thread someone asked about locking the zoom ring on this lens - it never occurred to me that zoom creep might be the cause, though in hindsight that's all it can be.

@Nicola, You can carry a roll of Gaffer's tape and tape the zoom ring to keep it from rotating but that's tedious.  You can look for some wide rubber band that can straddle both the zoom ring and the lens barrel with good tension to lock the zoom ring in place.  This arrangement should allow you to turn the zoom ring as you see fit, the trick is finding the rubber band or neoprene ring of appropriate size.

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