TTArtisan released an intriguing 10mm F2.0 for APS-C systems. It's manual focus and manual aperture but it's 10mm F2.0 so there's that. Because there are no electronics, Canon ignores it as if it does not exist and so it's available for the RF mount.
Unfortunately, it has a fair amount of tangential astigmatism which makes it unsuitable for astrophotography, but for a 10mm lens even on APS-C you in most cases can live without autofocus, so it's a useful lens, even if you only use it for terrestrial photography. Keep in mind that this lens is incredibly inexpensive for a mind-boggling low price of $159.00 – so it's hard to go wrong with that. If you read about an optical flaw, remember .. $159.
Phillip Reeve has a good review of it here.
This lens’s mid-frame and corner sharpness, at wider apertures is weak, but it is very sharp in the center right from f/2 and sharp everywhere at f/8 or smaller apertures. Most of this lens’s applications do require stopping down to f/8 or f/11 anyway, where the lens sharpens up everywhere in the frame. The coma issue fails this lens in the only application that requires sharpness wide open to the edges and corners, astrophotography. You can still use this lens for astrophotography, as it has good control over the worst type of coma, just put the most important part of the sky in the center of the frame. On the other hand, its price and sharpness, stopped down to f/8, together with its gorgeous sunstars, makes it one of the most (if not the most) affordable and best value for money ultra wide angle lenses available for APS-C.
Purchase when it is in stock from B&H Photovideo here.
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