The Sirui 50mm T2.9 1.6x lens has a compression ratio of 1.6 times. Shooting in 3: 2 will have an aspect ratio of 2.4: 1. When shooting in 16: 9, there will be a much wider 2.8: 1 aspect ratio, and the viewing quality will be as excellent and immersive as IMAX. … The Sirui 50mm T2.9 1.6x lens offers four mount types: Canon RF, L-Mount / Leica L, Sony E and Nikon Z.
Sirui 50mm T2.9 lens specifications;
• Focal length — 50 mm;
• Optical design — 16 elements in 13 groups;
• Light transmission — T2.9 – T16;
• Number of aperture blades — 10;
• Coefficient of anamorphism — 1.6x;
• Minimum focusing distance — 0.75 m;
• The maximum magnification is 1: 12.83 vertically and 1: 20.42 horizontally;
• Installation diameter of filters — 82 mm;
• Diameter — 88 mm;
• Length — 140–142.9 mm (depending on the mount);
• weight — 1030.6–1073.6 g (depending on the mount).