Help! Commlite adapter parfocal issue on 24-105mm on the A7s.

G

GrumpyOrang

Member
I've recently pre-ordered the A7rii and currently own the Commlite adapter EF to E mount. However yesterday when I borrowed a friend's A7s I was shooting with the 24-105mm L on the Commlite adapter and noticed serious backfocus issues. As far as I understand the 24-105mm is a parfocal lens (or close enough) and it acts that way on my Canon body as well. Has anyone had this issue? I do videography often and it'll be a total pain if this problem persists when my A7rii arrives, as I assume it would have the exact same problem as the a7s on my 24-105mm. Is there an EF to E mount adapter that is known to retain the parfocal-ness of these Canon lenses? FotodioX? I've searched on google for a while and have come up with very little on this matter. Please help!! :(
 
Well, I own the Metabones Smart Adapter IV, and I can tell you that when attached to the Sony FS7, the 24-105L is NOT parfocal as well....annoying, but guess I have to deal with it. Hopefully there is a solution!
 
The only parfocal Canon lens is the 70-200 2.8 (non-is) according to lensrentals. So you are asking for something that can't happen :)

My experience with all Canon lenses is the same as well, although I understand what you're saying about the 24-105 being almost par focal on your Canon. I had 3 copies, and one of them was "almost" par-focal as well, but it really wasn't.

Any adapter will just augment the issue, unless you are really lucky and somehow end with a working combination.
 
It is strange but I ordered nonelectronic (pasive) EF-NEX Adaptor (Fotga) and my 24-104 works great. Great - I mean when I set focus at 105mm and go to 24mm everything i focused on is in focus! Why Commlite doesnt work the same way? Rememberthat Fotga adaptor is pasive so has no electric pins and you are not able to change lens aperture but it works!!! I noticed that Commlite is just to long and because of that the distance between lens and sensor is just too big making our lenses more parfocal than these really are!
 
You are probably really lucky as I've already noted..Did you bother trying on 35mm, 50mm, 85mm, etc? :)

In addition, adapters have to keep the flange distance consistent, there might be some mm off, but it wouldn't be something you would be able to see with a naked eye from their exterior design.

jpblack said:
Any adapter will just augment the issue, unless you are really lucky and somehow end with a working combination.
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