Great choice for extra wide angles

martonlendvai wrote:

A great choice when it comes to picking an ultra wide lens for EF mount. Sigma alternative is significantly bigger and heavier...

...because Sigma is significantly faster (f/1.8) and way better optically.

Comparison at f/2.8 blows the Canon lens away in sharpness, CAs, lateral shading:

https://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=454&Camera=979&Sample=0&FLI=0&API=0&LensComp=1121&CameraComp=979&SampleComp=0&FLIComp=0&APIComp=2

Moreover Sigma is sharper at f/1.8 than Canon at f/2.8. Sigma also has noticeably less lateral CA even wide opened, about 1.5 stops less peripheral shading at f/2.8, less flare and more aperture blades (9 vs. 6).

So yes, the price for such massively better optical design are size and weight, which is kind of logical.

And the best at the end: Sigma is significantly cheaper.

The build quality is very good, but the black paint on the built-in hood comes off quickly just from the touch of the plastic cap. I suggest applying a protective layer on the inside of the cap to save the paintjob on the lens(hood).

Covers more than any other lens I have ever used with a very sharp main area while corners are still perfectly acceptable. I believe this is a huge thing when it comes to a lens this wide. Overall I would highly recommend this lens, just make sure to have a decent deal on it since selling is not that easy with this lens being from a very niche segment.

Strangely, my favorite way of using this lens was with a 1.3x crop sensor camera body, resulting in better corners and a still very ultrawide angle.