fg-one: Thanks for that. I can understand that it may be the case as the lense was recently serviced.
Here are three more comparisons from: F28/2.8, 50-135 @ 50mm, 50-135 @ 123mm, at both f2.8 and f8.
The F28 was at hard stop and the focal plane appears to be at similar distance to the M28 (15m).
The 50-135 could focus way past infinity at 135mm, where as at 50mm it could just go past (focus ring markings relate). So I manual focused this lense.
Having gone through the process of systematically posting images here, I now see that one can indeed have the focal plane at infinity (or a few Kilometres) away.
Thought it does appear that both 28mm lenses cannot reach infinity.
So my current question is:
-Is likely that the two lenses are out of calibration, or the body?
Thanks for all the help, and participating in public brainstorming.
T
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The F28 @ infinity:
The 50-135 manual focus, at 50mm:
The 50-135 manual focus, at 123mm: