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Hi Darren,
I also have an EOS-M42 adapter, the type that has the AF-confirm board included so I can use it for terrestrial photography too.
With mine there is a flange machined directly behind the internal M42 thread that the lenses apperature pin touches, and then gets pushed in as the lens is screwed down, I'm surprised yours does not have this.
Does yours have just a straight thru thread?
I had been looking at getting a couple of the non-AFC adaptors, now I'm not so sure.
One thing I have noticed, the manufacturer of the adapter I have has played cautious by making the adaptor considerably thinner than it needs to be(1.45mm instead of 1.5mm), causing lenses to focus well past infinity.
Kinda annoying considering most lens designers make them focus a very small amount past infinity anyway.
I wish they had been less cautious and made it 1.49mm instead of 1.45mm.
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