I see similar behavior
Hi.
I have an SMC Tak 150mm and it mounts correctly on my Spotmatic SP ... meaning that the red diamond on the distance meter is positioned at the top of the lens at "12 o'clock."
However, using a genuine Pentax m42 to K adapter on my K-7, the lens does not line up the same way, with the red diamond slightly to the right of top (1 o'clock) if you hold the camera as if you were taking photos.
So, while I can't say this is correct behavior, I can duplicate it on my K-7.
Actually I think MOST of my screwmounts never sit TDC as you describe, they're always a little off. Never gave me any issues.
Welcome to the forum and good luck.
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