It is still an existing lens (EF17-40mmL)! Before using FF camera, I never shot such wide angle view./ f& `2 i1 A6 C& b
To me, it is enough to shoot the most wide angle view of scenes.. f4 |4 A8 {0 G. U# ~9 P2 U/ K
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Sharing own experiences with this lens, I found little difficulty to set a perfect horizontal line. (Constructive problem)7 J! b$ w8 F4 h0 t+ [
Thus, I guess more difficult to shoot more extra-wide angle (> 93 degree) of scenes when using more super-wide angle or fisheye lens. 6 \+ k# \& ^/ o9 ]# X 2 R2 ~6 O' J5 nOf course, you still could say 93 degree = x super wide... # a5 N H( m9 ^' M& N# ^It would be considered as pure user's view.