I thought I would buy a new lens for my DSLR. From that point of view, it's worth noting that the image quality is on par with a regular lens, which is sharp and has good bokeh. Autofocus and lightfastness appear to be similar, but I didn't stress test them, just didn't notice any issues. I already had an (overpriced) ga-1 adapter because I used ND and polarizing filters (as well as UV protection) with the GR III, so this lens seemed affordable from that perspective: a super-sharp f2.8…