Testing out the zoom range of the Sigma Zoom-Gamma 21-35mm 1:3.5~4, the first 2-ring version of Sigma's Gamma series of ultra-wide-angle zoom lenses. This version was introduced in 1979. Economical, as it covers all four of the most important wide-angle focal lengths, the 21mm, 24mm, 28mm, and 35mm, in one compact combo.
On an MFT (Micro Four-Third) digital, the Zoom-Gamma 21-35mm 1:3.5~4 will be that of a standard zoom with the equivalent focal lengths from 42 to 70mm. The lens incorporates Sigma's unique floating element system, virtually eliminating all types of aberrations throughout the entire zoom range.
It is a super solid all-metal with 11 elements in a 7-group construction, weighs about 465 grams, and measures 105mm in length. The F stop range is 3.5 to 22 with half-stop clicks, and the lens is fitted in a floral pattern hood and takes in a 67mm filter size.
Images were shot with the lens mounted on the Olympus E-P5, at the focal length indicators of 21mm, 24mm, 28mm, 31mm, and 35mm. Post-processing and print finishing was done on Olympus Viewer 3 (OV3) and Google Nik Sharpener Pro 3.
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