It's not a joke. ; And it's for APS-C sensors - they are (right now) only planning it for Sigma, Canon EF and Nikon G mounts.
http://www.sigma-global.com/en/lenses/cas/product/art/a_18_35_18/features.html
I saw the rumors of this last night and EVERYONE thought it was a poor photoshop attempt/joke, mainly because it wasn't big enough.
http://www.sigma-global.com/en/lenses/cas/product/art/a_18_35_18/features.html
I saw the rumors of this last night and EVERYONE thought it was a poor photoshop attempt/joke, mainly because it wasn't big enough.