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The following is an unedited press release, shown as received from the company represented. We've elected to present selected releases without editorial comment, as a way to provide our readers more information without further overtaxing our limited editorial resources. To avoid any possible confusion or conflict of interest, the Imaging Resource will always clearly distinguish between company-provided press releases and our own editorial views and content.

Sigma's 4.5mm F2.8 EX DC Circular Fisheye HSM lens. PRESS RELEASE: The first Circular Fisheye Lens exclusively for use with APS-C size digital SLR cameras


  • 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 (case included)
Specifications (for Sigma mount)
Sigma's 4.5mm F2.8 EX DC Circular Fisheye HSM lens. Click here for a  bigger picture!
Lens construction 9 Groups
13 Elements
Angle of view 180°
Number of blades 6 pcs
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 / Ø 3in. X 3.1in.
Weight 470g / 16.6oz
Barcode No.
SIGMA AF 0085126 486563
NIKON AF 0085126 486556
CANON AF 0085126 486549
FRONT CAP ADAPTER CA486-72(supplied) 0085126 486525

(First posted on Tuesday, November 13, 2007 at 20:00 EST)

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