ED 100-400 f5.0-6.3 loose on mount?

its interesting to try it with a few other Olympus lenses, some are tight fit, some similar to the 100-400. As one maybe should expect, there is less play with pro lenses than others. Its all low level rotational play, no movement in any other plane and I have yet to have a problem arising from such "slop"

(out of interest, I saw similar variations with my canon lenses, the L lenses were always a "tighter" fit than others)

Maybe you do get what you pay for in terms of tolerances?

Pollos wrote:

sunnydayz wrote:

Helen wrote:

I've been meaning to ask (purely out of curiosity) - if you or any other forum members happen to have any Sigma lenses with an m43 mount (I don't) - do they have the same design of locking pin recess as the Olympus 100-400mm? Thanks.

I don't have any Sigma m43 lenses, but found on ebay some lenses for comparison.

Full disclosure: These images belong to the respective owners of the lenses put up for sale on ebay. These images are posted here only for educational purposes.

Sigma 30mm f2.8 mft mount

Sigma 19mm f2.8 mft mount

Sigma 100-400mm Sony mount

Sigma 100-400mm Canon mount

The Sigma lenses mft or other camera mount shows a milled detent. Notice the Sigma 100-400mm for Sony and Canon mounts do not have the locking detent insert found on the Oly 100-400mm.

As a side note, out of curiosity I've checked rotation play on a couple of my film cameras and there is a little play as well. All lenses will have a small amount of rotation play as there must be some mechanical tolerance designed in. I'm sure you've read other posts here that someone had some other lens that was too tight and they could not even fully mount the lens on camera.

Anyway, on a case by case basis, I guess it boils down to whether the lens someone received is way out of tolerance or they just don't like any looseness at all. The only remedy then is to contact Olympus or the retailer and see if an exchange or return for full refund is possible.

my 100-400 zuiko

My 12-40 pro

My 45 mm 2.8 sigma for Sony FE

I checked some size for pin and hole.

Em1mkii and penF and 12-40 are less of 2mm

Sigma and 100-400 are 2mm and this make the mount movement.

I hate little this movement because you can't buy an expensive lens and have this problems.

not expensive for what it is, remember its not a pro lens, despite its excellent performance

That's funny - so does mine !  When I turn the zoom control one way or the other there is a definite slight knocking noise and feeling. Don't get it with any of my other Olympus lenses or bodies.  I would say any movement is almost unmeasurable but definitely there.  I no longer notice it when using this  wonderful piece of kit.

OuP wrote:

Anyone have this issue? Got the lens a couple of days back and noted the lens is loose on the mount - rotates about 0.5mm (maybe more) but certainly noticeable. Tried it on OMD EM1 Mk11 and OMD EM1 M1 with same results. Checked other lenses and these don't rotate. Is this a faulty lens which should be sent back for a replacement?
Your advice appreciated.
OuP

Same here, I feel the lens rotates more than my other m43 and Fuji lenses, but don’t mind that much. I have kind of accepted it’s normal.

Mine has the same little movement.... it does not bother me, it does not affect anything.

Its normal. Olympus said that, i dont remember where..

Look answer here:

https://smallsensorphotography.com/100-400-mount-clarification

Mine is exactly the same. My PRO lenses do not have this slight movement.  Seems to be normal for the 100-400.  Strange but not a problem.

R