It is still an existing lens (EF17-40mmL)! Before using FF camera, I never shot such wide angle view.$ F5 B3 G+ |1 @2 {# s0 y
To me, it is enough to shoot the most wide angle view of scenes.( Y7 |* E6 s, N. f0 y' G2 _
! `: o' Q9 F0 f0 K* y4 w' ^6 |Sharing own experiences with this lens, I found little difficulty to set a perfect horizontal line. (Constructive problem)2 I! {% Q( p$ y5 ]0 x M
Thus, I guess more difficult to shoot more extra-wide angle (> 93 degree) of scenes when using more super-wide angle or fisheye lens. 1 Y3 V- r) ]8 T , b! [! K8 t V! W" \5 J
Of course, you still could say 93 degree = x super wide... & b X- U9 `. wIt would be considered as pure user's view.