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E-SystemComparison of Sigma 8mm full-frame fisheye with the 11-22 Zuiko Digital. In July 2004 I borrowed an 8mm SIgma fisheye in MF, OM mount to try out on my Olympus E-1 digital SLR as an ultra-wide angle, as the widest currently available lens is the 11-22 Digital Zuiko. This is a lens that produces a round image on 35mm film. I mounted the lens on an E-1 and tried taking some comparisons with the Zuiko-Digital 11-22 f/3.5 zoom. The Zuiko is an Aspherical lens, whereas the Sigma is 80's vintage (and designed for film), so I expected some differences. But the 11-22 literally blew the 8mm lens away. This isn't a perfect test, but it's illustrative. The images were captured handheld with the E-1 in bright, mid-day sunlight. I used Aperture priority, with the slowest speed at f/16 being 1/80 at ISO 100. The images were captured in Olympus' RAW(ORF) format and converted to 16-bit TIFF's using Olympus' Viewer. The 100% crops below were cut using Photoshop CS. There was no post processing except for the 11-22's center images, where I used levels to even out the exposure, as the shadows were pretty heavy. In-camera settings were Sharpness at +3, Saturation at normal, Contrast at normal, Adobe 1998 color space. Full-Frame shot using the 8mm at f/16. It's actually very nice and perfectly acceptable for a full-frame shot
Comparison of center images from both lenses. What struck me was the great performance of the 11-22 wide open, where the Sigma doesn't even come close to the Zuiko/s f/3.5 performance until f/16, and never really comes close then. You can see the steady improvement of the Sigma as you stop down.
Once again, the Sigma at f/16 is just about equal to the Zuiko at f/3.5.
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All images and data are copyright © 2000-4
Skip Williams. |
