Is everyone getting infinity focus with the jinfinance adapter? I think mine may be just short of reaching it.
Finally bought a G1 today (yes, I bought the adapter first and then the camera!) so just now had a chance to test infinity focus with my jinfinance adapter.
My adapter was too thick and would not reach infinity.
Rather than sending it back and waiting to see if jinfinance can sort this out with his OEM, I did the following:
-- Remove the M lens flange by removing the four Phillips-head screws. Don't worry, there are no loose parts to fly out.
-- Place the flange lens-side-down on a sheet of wet #600 abrasive paper on a flat surface.
-- Rub the flange against the paper in a circular pattern, changing grip frequently. (Warning to renters and married people: This is a messy operation.)
-- Rinse and dry the flange, then re-assemble to test infinity.
--Lather, rinse, and repeat.
Before doing this, I had measured the total thickness of the adapter with a digital caliper, getting a nominal thickness of 8.67mm. By the time I had thinned the flange enough to get good infinity focus, the total thickness was 8.57mm. In other words, I had to remove 0.1mm from the face of the adapter. Your millimeterage may vary.
More words to the wise based on my experience:
-- The screws that hold the flange to the adapter body are of somewhat indifferent quality. It's easy to damage the screw head when trying to tighten it securely, even if you're using the correct-size screwdriver and exercising normal care (ask me how I know this.) If you really mung up the screw head you'll be in deep tapioca, because you won't be able to remove the screw again! (Fortunately, I avoided this fate.) Suggestion: instead of relying on firm tightening to hold the screws in place, use some sealer on the threads and tighten just enough to be secure. Apparently that's what the factory does too, as I found evidence of whitish sealer on the threads.
-- Because the screws are small and there are only four of them, you might want to keep one hand under the lens at all times if you are using your new $10,000 f/0.95 Noctilux on your G1 via this adapter. (Or, if you really are using your new f/0.95 Noctilux, have one of your entourage or a servant lie on the ground under the camera to absorb the impact if the lens falls off.)
-- When thinning down the flange as described above, you shouldn't have to worry about the lens still fitting tightly against it; the "leaf springs" that are cut into the flange's bayonet lugs are supposed to pull the lens firmly against the face of the flange However, I noticed that the top "spring" seems to fatigue easily, and most of my lenses developed a bit of play at the top after even slight use. I tried spreading the "leaf" with the tip of a screwdriver, which helped a bit, but it seems likely that it will fatigue again soon. Supporting the weight of the lens with your free hand should help work around this problem.
This experience hasn't left me totally disappointed in the jinfinance adapter -- it does seem to work well as long as I keep a hand under the lens barrel, and I intend to keep using it until I can afford a house call from Doctor RayQual. But it does seem to suggest that you get what you pay for with these adapters.