Sigma claims this is the world’s first f/1.4 diagonal fisheye, the unique feature here being its f/1.4 maximum aperture. This alone would make it a very interesting option for astrophotography ...

I love the huge viewing angle and funky-looking distortion of fisheye lenses, this one being a ‘diagonal’ rather than ‘circular’ fisheye, so it delivers a frame-filling image on the full ...