It is still an existing lens (EF17-40mmL)! Before using FF camera, I never shot such wide angle view. - ^2 r1 p |8 }5 q3 Z7 Z" GTo me, it is enough to shoot the most wide angle view of scenes. ! V4 e$ q9 E# v# h! h o 1 A1 Q; t& n$ r. y; `
Sharing own experiences with this lens, I found little difficulty to set a perfect horizontal line. (Constructive problem) : C1 l" U+ O, P) tThus, I guess more difficult to shoot more extra-wide angle (> 93 degree) of scenes when using more super-wide angle or fisheye lens.) b& [9 K# a* ]1 b
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Of course, you still could say 93 degree = x super wide... $ k) i6 t6 j; u5 g' N- VIt would be considered as pure user's view.