So I got a "new to me" lens and 2x converter for a small amount. Both seem fine but I am confused about the way the lens mounts to the body of my K10. The lens is a SMC Pentax-M 1:2 50 It is also marked ASAHI OPT CO JAPAN. I have played with it a little and it seems to work as expected fully manual. Where I am confused/concerned is that it will not fully lock onto the body. Rather than starting at one red dot and ending at the other, it only wants to go about 2/3 of the distance. It does not seem to matter and nothing looks damaged anywhere on the lens but I thought I would ask why this might happen.
Thanks in advance for any explanation/suggestion/warning.