NewsNovember 2007

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Sigma 4.5mm EX DC Circular Fisheye HSM

Sigma has for the first time marketed a true fisheye optic for crop sensors, projecting a circular 180° image onto APS-C sensors. The new lens sports a focal length of 4.5mm and maximum aperture of f/2.8, HSM silent focusing and SLD low-dispersion lens elements. Aside from the 'edgy' skateboarding shots and frankly unflattering portraits often seen, circular fisheyes are actually quite useful for astrophotography and scientific applications. Pricing and availability is yet to be announced.

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• Specifications

Press Release:

The first Circular Fisheye Lens exclusively for use with APS-C size digital SLR cameras

4.5mm F2.8 EX DC CIRCULAR FISHEYE HSM

• The first 180 degree circular fisheye lens designed specifically for APS-C size digital SLR cameras
• Fast F2.8 maximum aperture making it ideal for low light photography
• Minimum focusing distance of 13.5cm and a maximum magnification of 1:6
• SLD glass minimizes color aberration
• Equipped with HSM with full-time manual focus override
• Equisolid angle projection method is possible for art and scientific use

The Sigma Corporation is pleased to announce the launch of the new 4.5mm F2.8 EX DC CIRCULAR
FISHEYE HSM lens.

This autofocus circular fisheye lens has an angle of view of 180 degrees in all directions. It is exclusively
designed for digital SLR cameras with the APS-C size image sensor. When used in conjunction with digital
SLRs with APS-C size image sensors, it produces circular image within the frame.

The F2.8 large aperture value produces a bright image in the viewfinder and allows photographers to take pictures in low light conditions, making it an ideal lens for Astrophotography and Aurora photography. Due to the quantifiable angle/area relationship it produces, this lens can be used for scientific and arts applications such as solid angle measurements of cloud distribution over the sky or vegetation distribution of the forest.

The minimum focusing distance of 13.5cm/5.3inch and maximum magnification of 1:6 make it particularly
useful for close-up photography. SLD （Special Low Dispersion） glass provides effective compensation of
chromatic aberration. Sigma’s Super Multi-Layer Coating minimizes flare and ghosting. It is equipped with
an inner focusing system that creates high definition and good image quality over the whole frame. The HSM （Hyper Sonic Motor） ensures fast and quiet autofocusing and allows full-time manual focus override by rotation of the focus ring.

4.5mm F2.8 EX DC CIRCULAR FISHEYE HSM specifications

Lens construction	9 Groups 13 Elements
Angle of view	180°
Number of blades	6
Minimum Aperture	F22
Minimum Focusing Distance	13.5cm/5.3in
Maximum Magnification	1：6
Filter	Insertion-type gelatin filter into rear of the lens
Dimensions (Diameter x Length)	Ø 76.2mm X 77.8mm / 3in. X 3.1in
Weight	470g / 16.6oz