Buy the lens at http://SDP.io/s15art

Tony Northrup reviews the amazing Sigma 15mm f/1.4 Art lens, the first fisheye lens with professional sharpness and light-gathering capability. The lack of geometric correction creates incredible optical qualities for astrophotography, in particular, and it shows almost zero coma when looking close-up at stars.

It's also a really compelling lens for street and travel photography, providing an interesting perspective on the regular world. Straight lines become curved; boring subjects become interesting.

0:00 Introduction
1:31 Design & Handling
2:58 Astrophotography
4:15 General Use & Travel Photography
5:10 Sharpness
5:27 Background Blur & Depth-of-field
6:10 Challenges working up-close
7:05 Bokeh
7:16 Summary