looks inviting

Yes, strange, in fact it's the fire emergency exit...

thistle, D200

I recently noticed that my copy of the 10.5mm actually has a slightly loose front lens group that can be rotated just by the light force of cleaning with a fiber cloth. I tried to carefully tighten what looks like the retaining ring to no effect (it did not move and appeared tight). The performance does not seem to be affected and is still excellent on my Z8. Another note is that it for a long time has developed what I initially thought could be beginning separation, which is visible slightly below the center in the 3rd image in post #24. However after inspection of the optical diagram it appeared to my relief to be a shard or other anomaly at the back lateral edge of the front element and does not affect image quality.

Thanks, Paco!

Thank you Akira!