The above 100% blowup shows just how sharp the Sigma 50mm f/1.4 ART lens when used on my Fuji X-T1. Manually focused using the peaking function it is amazingly crisp. I only have a relatively cheap Nikon > Fuji X adapter, but it works fine. There are stories that adapters sometimes misalign lenses thus taking away overall sharpness, but I must say I've used a lot of adapters and never had a problem with that.
I shot quite a few tests with the Fuji and they were all very impressive. Now how often I use this remains to be seen, since as you can see it is a very large (and heavy) combination. But it's nice to know I have an option that gives such sharp results.
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