The RF mount has allowed Canon to go all the way to 15mm with their broad angle zoom, and also you get a fast f/2.8 aperture via the focal length as well. Naturally Canon also has a spread of their premium “L” lenses available for the RF mount.
Compound designs, such as a Schmidt Cassegrain, are compromise designs to make a much more transportable design, but even they produce diffraction-limited photographs with solely a few mirrors and a few lens. A great selection for WA, not as flexible as tokina 10-17mm, but primes generally have barely better IQ (image high quality).; Made for cropped sensor only, though the lens will work with a full-body digicam.
Keep it Light
Can be used with a 1.4x teleconverter for shut-focus photographs that aren’t so extensive, the identical as using the tokina 10-17mm at 15mm. It presents impartial management over three lens rings for …