True. I notice this with my m42 adapter and lenses with narrow base, like Helios 44. the genuine Pentax adapter has a little wobble, which can make one part of the photo less sharp, because it is wobbled differently as you are focusing and composing, than it is when you press the shutter. And the focus plane being off is almost like a tilt lens lol
Similarly, I think my Samyang 14mm is a little off, the left side is not perfectly sharp when I take photos of stars (stars look like lines, but only on the left half of the photo) - I assume its because either one of the elements or the mount is just a little misaligned. Not 100% parallel, and with 14mm, that becomes noticeable
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