The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 10mm F2.8 EX DC HSM Fisheye and the Sigma 10-20mm F4-5.6 EX DC HSM for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Sigma 10mm F2.8 EX DC HSM Fisheye is the longer of the two lenses at 83mm. The Sigma 10-20mm F4-5.6 EX DC HSM with a length of 81mm, is 2mm shorter. On the other hand, the Sigma 10-20mm F4-5.6 EX DC HSM has a larger diameter of 84mm compared to the Sigma 10mm F2.8 EX DC HSM Fisheye's 76mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Sigma 10-20mm F4-5.6 EX DC HSM weighs 470g, 1% (5g) lighter than the Sigma 10mm F2.8 EX DC HSM Fisheye's weight of 475g.
Lens Mounts
Both the Sigma 10mm F2.8 EX DC HSM Fisheye and the Sigma 10-20mm F4-5.6 EX DC HSM has the same Sigma SA lens mount. Some of the latest released cameras that are compatible with the Sigma SA lenses are Sigma SD1 Merrill, Sigma SD1 and .
Sigma 10mm F2.8 EX DC HSM Fisheye is also available in the Canon EF and Nikon F (DX) mounts.
Sigma 10-20mm F4-5.6 EX DC HSM is also available in Canon EF , Four Thirds, Pentax KAF, Sony Alpha and Nikon F (DX) mounts.
Focal Range
Sigma 10mm F2.8 EX DC HSM Fisheye is a prime lens with fixed focal lenght of 10mm which has an effective (full-frame 35mm equivalent) focal range of
15mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 10-20mm F4-5.6 EX DC HSM has a focal range of 10-20mm and 2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 15-30mm when used on a APS-C / DX format camera.
