|Posted: Sat Jun 02, 2018 4:18 pm Post subject:
as Kypher says, one of those tabs controls only the aperture, and the other controls the aperture + DOF indicators. I watched your video and can see that you indeed have a Retina-Xenon, but couldn't be sure that the broken tab was the left or right one as cypher described (they should move in unison when working properly).
So you definitely have a problem, but when you say the adapter isn't working, can you be more specific? Is the aperture working but not the DOF indicators (in which case your left-hand tab is the one that is broken)? If the aperture will not open at all, then I'd return the lens.
Also, as others have mentioned, the best option for working with DKL lenses on the A7-series is to mount them on an intervening adapter that has a focus helicoid, which allows you to overcome the long minimum focus distances that these lenses have. I used the DKL-to-M42 adapter made by eBay seller c-yeenon. It's excellent. I then mount lens+adapter on a M42-to-E adapter (with focus helicoid, also made by c-yeenon).
Good luck, the Retina-Xenon is a lovely lens
Digital Camera: Canon 5Ds, Leica MM246, Sony A7r
b]SLR Lenses[/b]: Carl Zeiss T* (C/Y, ZE/ZF.2, M42); Pentax Taks 50/1.4 (7 & 8 elements versions), 85/1.8; Mamiya 55/1.4; Meyer 55/1.8 (all M42).
[b]RF lenses: Zeiss ZM, assorted Japanese LTMs & Nikkor-S