timballic
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The small screw is "usually" there as a stop, to prevent the adapter being turned beyond its designed stop point, where it might jam. So be careful not to turn too far, with the ones where you've removed it!
(So far, all my adapter mounts do fit, without needing to remove the stop screw.)
[EDIT: I've just checked my Signature edition Tough E mount, and it relies on a different stop, built in to the mount, so if the standard Fotodiox Tough E mount is the same, you shouldn't be able to turn the adapter/lens too far, even without the screw.]
For interest, I had a long correspondence with Phillip Reeve, on why the Tough E Mount makes the difference it does cf. the native mount (I'm using the "brass finished Fotodiox "Signature" 2015 edition)
Eventually, after much theorising, and close comparison, I discovered:
The native Sony E plastic spacer, have notches on their lower side, where the end of the spring plate "arms" x3, fit when a lens/adapter is attached (Could do with an app to add arrows! the notch is at 11 0'clock position, below and between the hole and upper one of the two shiny black circles)
 Sony E mount plastic spacer by Timothy Ball, on Flickr
 IMG_6934_Lr5 by Timothy Ball, on Flickr
The signature version has no notch, so the spring arms are much tighter
 Fotodiox Signature by Timothy Ball, on Flickr
 IMG_6936_Lr5 by Timothy Ball, on Flickr
Here you can see one of those spring arms.
 Signature Tough E by Timothy Ball, on Flickr
Below, on the Shoten mount, the "notches" are faithfully copied from the Sony plastic spacer, with the result that the Shoten mount doesn't hold the lens/adapter as firmly as the Fotodiox Signatute mount does. I verified this, when I changed to the Shoten mount on my IR converted A7. It wasn't a lot tighter than the original.
I ended up "bending" one of the spring arms to a more curved profile (only one needed bending, as the profiles varied from arm to arm...not by design I decided!)
 DPP_12 by Timothy Ball, on Flickr
We also concluded that the reason the mount loosens over time (every mount) is because the spring plate arms become flatter after many lens changes. Also, the profile of the sprung arms, isn't constant. So some new cameras (A7, A7r) have looser mounts than others from new, and others just wear loose.
I don't own one to verify, but from pictures on the web, the "normal" Fotodiox Tough E mount also appears not to have the notches.
I really need to buy a spare spring plate, for when the original one weakens, even on the Fotodiox Tough E mount!
Edited on Mar 19, 2016 at 06:10 AM · View previous versions
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