Sigma 4.5mm f/2.8 EX DC HSM (Motor-in) Lenses

Sigma 4.5mm f/2.8 EX DC HSM (Motor-in) Lenses

The fisheye look is an acquired taste, albeit one that has an immediate seductive quality. While you can correct some of the inherent distortion using various programs, the point is not to create a "straight" image with a very wide angle of view but to enjoy the ride of this "beyond peripheral vision" optic. There are two types of fisheye--one rectilinear, with the standard rectangular frame and less angle of view--and the other hemispherical, the type featured in the new lens from Sigma.

One of the truly amazing qualities of the fisheye is the almost ridiculous depth of field available at even modest apertures. As you know, one of the determinants of depth of field is the focal length of the lens, and when you use either a 10mm or 4.5mm focal length (with a minimum close focusing distance of 5.3 inches in both lenses) at even f/8 you get sharpness from 3 feet to infinity with ease. Add the amazing amount of foreshortening these lenses afford (the seeming enlargement of close subjects when focused close in relation to the distant background) the picture possibilities are fairly mind boggling.

Surreal Scenes
There's no question that working with a fisheye can put you in an odd frame of mind. The low angle sun was hidden behind this triangular building; note the flare on the black, non-image field, caused by shooting in very bright light. This did not seem to have an effect on the image itself. Exposure with the 4.5mm lens was f/16 at 1/250 at ISO 200.
All Photos © 2008, George Schaub, All Rights Reserved

The 4.5mm f/2.8 lens (MSRP $1400, less in many outlets) is said by Sigma to be the first 180-degree circular fisheye made specifically for APS-C digital SLRs, and the HSM (motor built into the lens) opens this up for users of those cameras without built-in lens motors, such as the Nikon D40x used in this test. Yielding a 180 degree angle of view, the unit is fairly small (3 x 3.1 inches) and light weight (about 16 oz.) Available in Canon, Nikon and Sigma mounts, it's constructed of 13 elements in 9 groups. Being of the DC variety, it utilizes SLD (special low dispersion) glass and is super coated to minimize ghosting and flare.

The City at Night
A bizarre place often calls for an odd point of view, and this was amply supplied by the Sigma 4.5mm f/2.8 lens in this shot made in New York's Times Square area. The lens encourages you to shoot at odd angles. Exposure at ISO 640 was f/4 at 1/30 sec. Note flare in non-image area caused by bright lights.

I can attest to that flare-reducing quality as I shot with the lens mostly at night in and around NYC's Times Square, a bizarre area that to me matches up perfectly with the fisheye experience. I worked in a range of ISO 400 to 800 and never had to worry about shake due to the fast f/2.8 max aperture.

The framing certainly is interesting: in fact, if you shoot straight ahead with the 4.5mm lens, watch out for your shoes appearing in the bottom of the frame!

Looking Up, and Rectangular Crop
The towering skyscrapers in midtown NYC are made even more impressive, and somewhat more claustrophobic feeling, when exploiting the severe barrel distortion of these lenses. Once you start shooting with a fisheye you get hooked into a decidedly different point of view. If you want to make a "normal" bordered print out of it most any software with perspective and distortion control can do the trick, admittedly creating a smaller file size due to the cropping that needs to take place.

The full report on two new Sigma fisheye lenses, including a 10mm version, will appear in an upcoming issue of Shutterbug.

Contact: www.sigmaphoto.com

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