I have the exact same problem with my XK AE finder. My investigation after taking the top off, looking around and pressing the detent button on the finder itself indicates mine needs repair. No amount of forceful pressing on the finder will release it.
I'm glad yours found another way to be...
I guess my only point was the small distance on the knob from 6 ft to the infinity mark. If you want to focus on someone at the 6-ft mark and really blur out the background probably best to place your subject at the 6 ft mark with the zone of sharpness, as it's known, ending on the 6 ft mark...
Fully endorse the sentiment. The photos are fantastic. Love the attention to detail allowing for Sharp focus of the foreground object and the fade in the background. Takes a little bit of effort to achieve that given the incredible depth of field of this lens
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