I've seen this before. There's 2 causes I've noted:
1. There's something broken underneath the aperture ring.
Sometimes one of the springs used for the A position is loose.
Easily repaired with a very tiny screw.
2. Plastic fatigue. Saw one lens where the ring had been
stretched a bit. Perhaps a faulty piece of plastic.
This made it ride unevenly and feel loose on the lens.
The solution is a replacement ring. Not necessarily a
worthwhile undertaking.
My son, who just got a used ZX-10, wants to sell his A50/1.7.
Collin
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