Betrayed by the age and weight of the bodies and lenses, I bought a lighter and more modern Sony body. The Canon 28-105 USM was a faithful companion, so I can keep it thanks to this adaptor ring.
09/10/2024
perfectly machined ring that respects the dimensions related to the camera. I have a Sony A7III, the flange length is 18 mm. In M42 mount, the flange length is 45.46 mm. The adapter must therefore measure 45.46 mm - 18 mm = 27.46 mm. Measuring with the caliper of my M42 K&F ring is 27.42 mm. We are almost perfect. It is slightly shorter than it should be (-0.04 mm) but this allows you to reach infinity without any problem. I did the same calculations and measurements for the Sony A7III and the K&F ring for Minolta MC or MD, the ring must be 25.5 mm. Measurement taken, this is the dimension of my K&F ring ... Bravo! On the other hand, I bought Fotga rings, there are 0.35 mm TOO MUCH! (in M42) so infinity is impossible to reach. Same observation for this brand with rings for Minolta and especially Konica (where the inaccuracy is much greater). It is true that the K&F, especially the new ones, are bigger and heavier than the competition, but that is the price of accuracy.
09/10/2024
For that matter, the problem arises that the e-mount and the object must be removed and not stored.
07/10/2024
Bought some time ago for my Sony A7R V, for some creative laps with old manual lenses. Excellent bayonet and good thread too, it almost doesn't seem like they are adapted lenses. I didn't detect any light leaks, even backlighting in July at 13, plus the flare that vintage lenses are prone to. Expensive, but great.
16/07/2024
I bought this adapter to mount it on a Sony case (the 6700) and use the Tokina lens (ATX I) in manual mode.
22/06/2024
Compared to other and cheaper brands of adaptor, this range from K&F Concept really are superbly built. The machining is first rate with tight tolerances and the matt-black interior helps to cut-down unwanted reflections.
06/06/2024