K-50 problem
That’s the symptom of the aperture failure.
K-3 II, K-3 and a K-70 from SRS

David
The fixes are now well-known, and that's why my K-30 already has had a "new but old" White solenoid fitted - I don't think I actually ever saw any positive proof of the issue but there were several instances when, on reflection, the initial first shot symptoms may have occurred (and that was at rather less than 10k actuations).
K-3 II, K-3 and a K-70 from SRS

yippeephoto
Member
Is this the beginning of aperture block failure?