Sigma 4.5mm f/2.8 EX DC HSM Lens

Product Summary

Model name: Sigma 4.5mm f/2.8 EX DC HSM
Focus Type: Autofocus / Manual
Format : APS-C / Crop Sensor
Purchase options: Amazon | Adorama | B&H

Overview

This is Sigma’s premium quality circular fisheye lens and one that is widely used by professional photographers wielding major APS-C makes as the first option for this exotic perspective. Designed for the crop APS-C sensors this lens has a focal length of 4.5mm (on a 35mm format). Extreme distortion creating a circular image of the subject/field of view within a black border, this is the specialty of this fisheye lens from Sigma. Sigma states that the lens can be used for scientific works as week because of the equisolid angle projection system.

The lens features any of Sigma’s best innovations like the HSM (Hyper Sonic Motor) technology. This is comparable to the USM (Ultra-sonic Motor) technology that Canon has. The result is a very silent Auto-Focusing performance of the lens. Manual focusing ring is provided. In order to switch to manual a focus mode switch needs to be flicked.

The lens has a total of 13 elements arranged in 9 groups and gives an amazing 180˚ angle of view on an APS-C DSLR. The lens diaphragm is made of 6 blades and offers a wide aperture of f/2.8. The lens can stop down all the way to f/22. The minimum focusing distance of the lens is only 5.3” giving a maximum magnification ratio of 1:6. The relatively reasonable sized lens has external dimensions of 3.0” x 3.1”. The overall weight of the lens is 470 grams. It takes a insertion-type gelatin filter. The lens comes in Nikon, Canon, Sony, Pentax and Sigma Mounts. Available at Amazon | Adorama | B&H

Sample Images by Sigma 4.5mm f/2.8 EX DC Lens on Flickr

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