[Metal] Arrived much faster than promised. Works great. Allows me to attach old Leica screw mount lenses to my GFX body

[Metal] After seeing a YouTube video about them, I purchased some Soviet-era Industar lenses to try on my Nikon D850. Given how few M39/L39 to F mount adapters there are, I just clicked the buy button when I saw this, not reading the description fully. As the description notes, this adapter is MACRO ONLY and does NOT support focusing to infinity. At first I thought the lens was broken (though it did take some lovely macro photos), and then I checked the product description again. So, for what it is supposed to do, it works very well. The ring is very, very slim, barely adding any thickness between the lens and the camera body. It's machined metal, feels solid, and I imagine I'll get a decent amount of use out of it when I do macro photography, now that I know what it's for. Having been happy with this, I'm going to purchase FotodioX's other M39/L39 to F mount adapter so I can use my Industar lenses as intended.

[3 x 2.9 x 0.4"] These worked fine for me, and the lens alignment is closest to having the depth-of-field scale facing up. (better than some other brands I have used)

[Leica M] I am satisfied with the Fotodiox M39 to Leica M adapter. I'm using it with a Canon 50mm f/1.8 LTM lens and the Ultron 35mm f/1.7 LTM lens on a Bessa R4m Leica M mount camera. The adapter is solid and exhibits no play. Infinity focus is not a problem.

[3 x 2.9 x 0.4"] I was going through the ringer trying to find this for a while, especially with this particular set up. Now using this pairing, the focus is in fact not infinite. It is great for a macro and portrait zoning. Otherwise it does not give you the full range without modifications. BUT this adapter does work as advertised. Taking the mount of, i grabbed a pen cap and depressed the switch and rotated clockwise and the adapter came off. I had no wobbles or any issues with my lens staying fixed.

[3 x 2.9 x 0.4"] I have finally found a Leica screw mount lens adapter that is properly machined! I am talking about the Fotodiox PRO adapters, not the lesser Fotodiox model, or other brands. The PRO adapter has the 6-bit wells machined into the flange, and most important, they are accurately positioned. Next, the screw mount threads have the correct starting point, so the lens winds up in the correct rotational position. Lastly, the machining quality is first rate, with a beautiful smooth finish, and bayonet lugs that do not have any burrs to damage your camera. I have tried many Leica screw mount lens adapters. The Fotodiox PRO adapters get it right.

[3 x 2.9 x 0.4"] Works as advertised on a Leica M10 for making backwards-compatible vintage Leica LTM (screw mount) lenses.

[3 x 2.9 x 0.4"] This adapter works perfectly with my Canon 50mm 1.4 LTM. The DOF scale aligns perfectly, screws in tight and this solution is much better than the LTM M-mount + M-mount Fuji-X solution that I originally tried.

[Metal] Bought this to adapt a Voigtlander 75mm Color Heliar for a Leica M10. Very well made and the ability to add 6-bit coding is great.

[Leica M] So happy that there is finally an adapter that leaves the index at 12 o'clock. It was the one issue that has bothered me when mounting a Leica thread mount lens to an M body. Be sure to screw the lens on completely, or the index will be off by a hair. It's a well made product that feels like it will last for years.