* Focal length 50mm
* Aperture f/1.8
* Angle of view ??
* Filter size/type 52mm
* Construction Elements/groups ??
* Focusing type Internal HSM
* Closest focus 0.24m
* Weight 0.155kg
* Dimensions (Dia x length) 83.5×81mm
* It has a seven-bladed diaphragm and stops down to f/22
* Price 180CHF
*D-type lens design provides distance information as part of flash and ambient light exposure processes

CLICK HERE to have a look at all the photographs taken with this beautiful lens.

More to follow soon.

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Specification
* Focal length 10-20mm
* Aperture f/4-5.6
* Angle of view 102.4-63.8°
* Filter size/type 77mm
* Construction Elements/groups 14 elements in 10 groups
* Focusing type Internal HSM
* Closest focus 0.24m
* Weight 0.470kg
* Dimensions (Dia x length) 83.5x81mm
* Mounts available Sigma, Canon, Nikon(D)
* Tripod bush No
* Price 700CHF

CLICK HERE for more photographs taken by this fantastic lens

At 15mm it’s a little soft at the edges, although still nice in the centre, but by the time it gets down to the 10mm mark the edges have improved again. In fact, at the wide end, the overall performance was the best in the range. The lens has obviously been optimised for the shorter focal length as there was no distortion there, whereas the 20mm end did have a little pin-cushioning. Chromatic aberrations have been very well controlled with the employment of three SLD (Special Low Dispersion) elements, one moulded aspherical and two hybrid aspherical elements. Although not completely eliminated, they did not show up significantly.

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