It is still an existing lens (EF17-40mmL)! Before using FF camera, I never shot such wide angle view.$ ~% s- |# t I4 d5 J, g/ A
To me, it is enough to shoot the most wide angle view of scenes. g; a0 p8 Z& o3 `
0 |* j( X' e7 q; V' dSharing own experiences with this lens, I found little difficulty to set a perfect horizontal line. (Constructive problem)9 A- J; ~8 j# {% T) w+ F6 l% o
Thus, I guess more difficult to shoot more extra-wide angle (> 93 degree) of scenes when using more super-wide angle or fisheye lens. 5 w( J, S9 e* |# ^$ [" a ' Y" w$ d4 r' J. c: W8 j2 ^) E9 ]Of course, you still could say 93 degree = x super wide... ' P# V' |* L- iIt would be considered as pure user's view.