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Chief Editor - opticallimits.com
Doing all things Canon, MFT, Sony and Fuji
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Very impressive, actually!
My first rectilinear UWA lens was a 20 mm F/4 for FF, 1979, when I only had a 50 mm, and 100 mm macro

. Never looked back since, only went more WA when they became available (at 10 mm FF rectilinear currently

).
I would love it if they would produce a 5, 5.5 or 6 mm UWA for MFT, however, and it doesn't have to be fast. 10 mm I have covered with my Oly 7-14 already, and it is more than good enough as it stands.
Kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....
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It this little gem would be available back in 2014 when I got Oly 12/2, I would buy this one instead, no questions asked.
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Not with this vignetting and flare.
Chief Editor - opticallimits.com
Doing all things Canon, MFT, Sony and Fuji
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Quite a performance with its size and weight!
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Now, 3 stops of vignetting seem to be par for the course not only in FF land...
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That's quite a curved front element. Very appealing, especially if the focus scale is accurate.