Looking for wide angle lens

All/most lenses mentioned here are designed for APSC sensor cameras. So, you won't be loosing compression effect towards the edges. You see, the coverage of lens designed for APSC sensor camera is good enough only for ASPC sensor camera. If you were to use the lens designed for APSC camera on FF camera, you will get vignetting as coverage area of lens will be smaller than sensor area.(Mostly lens designed for APSC sensors don't fit on FF bodies, but some of them do).

Yes, if you are using a UWA lens that's designed for FF cameras, you will loose out on whatever effect that's present on edges, as sensor size will be smaller than coverage area of lens.
Thanks for the clarification
 
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