The KP J's "hat"
I submit that, just like the K-30's "baseball cap", it protects the lens mount from rain. It was described this way on one of the blogs I like to read:
The K-30's adverts were pretty overt about this, either showing it with water droplets like it had been to the gym, or right in the rain or similar wet situation:
Loving aperture rings, focus throw and distance scales.
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