SIGMA 4,5mm F2.8 EX DC HSM CIRCULAR FISHEYE for Canon

Extremely wide EX lens from the famous Sigma company has been designed as a circular fisheye. This means that the picture is, unlike the usual type, centered in a circle and does not cover the entire image. Thanks to measurable distortion, the lens can be used for science, technology as well as in many other sectors. It features an anti-reflective layer Super Multi Layer (SML)  that minimizes flare and ghosting of Sensors .
The autofocus uses ultrasonic micromotor, characterized by high speed and accuracy, which is also very quiet. The lens features a fixed focal length 4.5mm and a maximum aperture of f/2,8. It is designed for digital SLR cameras with APS-C sized sensor and a compatible mount.
Specifications:
Designed for cameras:
Canon
Focus:
HSM (ultrasonic motor)
Lens:
f/2.8 (f/22 minimum aperture)
Focal length:
4.5mm
Lens construction:
13 elements in 9 groups
Viewing angle:
180°
Minimum focusing distance:
13.5cm
Aspect Ratio:
1:1.6
Filter:
Front filter cannot be fitted
Dimensions (diameter x length):
76.2 x 77.8 mm
Weight:
0.47kg
Colour:
Black