RARE】SIGMA 28MM F/2.8 H.L. WIDE (BETTER THAN MINI-WIDE) À VÉTRIGNE

Here is a very rare Sigma 28mm f/2.8 H.L. Wide (NOT the much more common and worse Mini Wide) at an exceptional price + a nice Sigma hard case. The prominent metal cam (as well as a prominent plastic part) that is used to control the aperture from the camera was cut out, to enable mounting on Sigma SA cameras. So this lens won't allow auto-aperture on Pentax cameras. But it has an aperture ring, so it can be adapted, for instance, on a Sony mirrorless camera with a Pentax K to Sony E adapter, and be operated with no issues like any other adapted lens. Apart from that, the lens is mechanically faultless. Optically, there's a little scratch on the front lens, that can't be seen on images. A few painted markings are gone. Otherwise, nothing to report. Please read what Sigma says about this lens. It explains what the difference is vs the previous 28mm f/2.8 versions, like the Mini Wide. And yet, in 1985, SIGMA released a new prime lens. It was a lens that made a unique promise: “zero vignetting.” The lens went on sale as the SIGMA NON VIGNETTING 28mm F2.8. However, the term “vignetting” was not yet in widespread use, and so later versions instead used the name SIGMA H,L (Highlight) WIDE 28mm F2.8. Diminishing brightness towards the edges of the image is an inevitable problem with wide-angle focal lengths such as 28mm, due to the so-called “cosine fourth” law. Additional loss of peripheral brightness due to the large aperture (vignetting) only strengthens the effect. While there is no escaping the merciless “cosine fourth” law, SIGMA managed to erase vignetting through an optimal mutual configuration of each lens group within the retrofocus design. This method also minimized “coma aberration,” a color fringing effect that occurs as the amount of light increases. SIGMA had created a wide-angle lens with very little vignetting and – an additional plus – without the unsightly swirly bokeh pattern caused by vignetting of out-of-focus areas. The lens was the culmination of SIGMA’s research and experience with 28mm F2.8 lenses. Although its price was on the expensive side, the lens became an extremely popular item with lens maniacs and photography enthusiasts. Source: https://www.sigma-sein.com/en/ohsone/28mm_1/