Self-portrait using sunglasses -- or street shooting. Whatever, the unlikely combination used was EL-Nikkor 50mm f/2.8 and a Panasonic GF1 with mount modified to M42 (thanks, Erik!!). Focusing a moving target is a hit or miss affair of course, but that won't prevent me from trying.
The old, classic enlarger lens (mid '60s if memory serves) does quite well despite its vintage design and coating. CA nasties are well under control in fact, and sharpness is good even when the lens is pushed far outside its nominal operative range. Contrast is pretty low, as would be expected, and for many scenes, that becomes a bonus feature by itself.
I read the news about the new and fancy Nikon Z5ii before I commuted to Oslo today and instead of lusting for a new camera, enjoyed using the old GF1 today. I'm using a short helicoid 15-27mm that allows infinity focus with the EL-Nikkor.