Compare lenses

Canon RF-S 7.8mm f/4 STM Dual vs TTArtisan 11mm f/2.8 Fisheye

The Canon RF-S 7.8mm f/4 STM Dual and the TTArtisan 11mm f/2.8 Fisheye side by side, computed from this guide's catalogue.

Which to pick

Pick the Canon RF-S 7.8mm f/4 STM Dual if you want autofocus and a design for APS-C, which usually means smaller and lighter. Pick the TTArtisan 11mm f/2.8 Fisheye if you want a brighter f/2.8 (1.0 stops more light), for dim light and softer backgrounds; coverage of full frame, so it suits the larger-sensor bodies too; and a fit on more cameras (159 against 18 in this guide).

Still torn? Ask the guide about the Canon RF-S 7.8mm f/4 STM Dual and the TTArtisan 11mm f/2.8 Fisheye

Specs side by side

Rows that differ are in full colour; the better value is marked where one is better by any measure.
Spec	Canon RF-S 7.8mm f/4 STM Dual	TTArtisan 11mm f/2.8 Fisheye
Maker	Canon	TTArtisan
Focal length	7.8mm (prime)	11mm (prime)
Full-frame equivalent	12mm on APS-C	11mm
Maximum aperture	f/4	f/2.8brighter
Made for	APS-C	Full frame
Mounts	Canon RF	Sony E, Nikon Z, Canon RF, L-Mount, Leica M, Canon EF, Nikon F
Stabilised	no	no
Autofocus	yesautofocus	no, manual focus
Weight	130 g	not listed
Cameras it fits	18 in this guide	159 in this guidefits more cameras

Focal range, in full-frame terms

Canon RF-S 7.8mm f/4 STM Dual: 7.8mm on APS-C, like 12mm.

TTArtisan 11mm f/2.8 Fisheye: 11mm.

Aperture

Canon RF-S 7.8mm f/4 STM Dual: f/4 wide open.

TTArtisan 11mm f/2.8 Fisheye: f/2.8 wide open.

Each opening drawn to scale against f/1.4: a smaller f-number lets in more light and blurs the background more.

Field of view

How wide each sees, at each end, on the sensor it was made for.

Cameras they fit

18 cameras in this guide take both, so either works on the same body. In all, the Canon RF-S 7.8mm f/4 STM Dual fits 18 and the TTArtisan 11mm f/2.8 Fisheye 159.