[wim]

There's voigtlander 10 MM f5. 6 even wider and already available in Sony mount
Aside interior and real estate photography I don't see where I would use such lenses, I don't remember the last time I needed anything wider than 16mm full frame

I've used the Samyamg for event photography, to get an overview of an entire hall / conference room, or a special shot from the speakers rostrum and such. Even 10 mm on FF is sometimes not enough. Of course there also is the possibility to get different perspectives with such an extreme UWA lens, which you could not get otherwise .

Kind regards, Wim

I get your point, maybe I am biased because when I need extremely wide I don't hesitate to use a fisheye, and checking some old pictures (before COVID-19) an ultrawide is very interesting for the dance floor in weddings, although 16mm is wide enough for me

I've dabbled with defishing fisheye photographs, but I never found the results very pleasing beyond the center of the image, hence I prefer a proper rectilinear extreme UWA, provided it is a good one. I never liked the Sigma 12-24 with all the smearinng in the corners and edges, even the Canon 11-24 is not optimal, but I do like the Samyang 10 mm, at F/8 that is .

Kind regards, Wim

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I came across the review yesterday:

https://www.youtube.com/watch?v=wLizgzitfR4

Christopher Frost reviews it ...... small, filter thread,  soft corners on FF ...... loads of vignetting ..............

Yes, saw that too, not all that impressive .

Kind regards, Wim