Found one of these recently for a few dollars and couldn't pass it up. Like many early 80's telephoto zooms this one's still got a good bit of metal in its construction and feels solid without being too heavy. During this time the popular tele zooms were usually around 70-210 more or less. For those people whose pockets weren't deep enough for the f3.5 to f4 zooms in that range, but wanted no part of the variable aperture zooms (we know the type: f4-5.6) Sigma offered a slightly reduced range (100-200) and a modest, but constant maximum aperture of f4.5. We stocked this lens at the family camera shop and sold quite a few. I like the finish of the trim on the lens barrel (I have a 135mm f3.5 mini tele with the same finish). My copy does have a bit of zoom creep, but otherwise is in really good condition. Since this is a budget lens I thought it only right to attach it to a budget SLR: the Minolta SRT 100. While I know the SRT 100 only gives up the 1/1000 second setting and a few other features, I wondered how the zoom would do. It had been a long time since I even saw one of these and at the time we sold it I had a Soligor 80-200. First, the lens.