Hi coase, I have the Vivitar S1 28-90 2.8- 3.5 and it's one of my favorites. It's quite usable wide open, and sharpens up a little more with each of the first two clicks. Depending on type of background, distance to the background, lighting and f-stop, it can produce some nice bokeh. My copy is in Minolta mount and in very good condition. There were a lot of them made, in different mounts, and the most important thing is getting one in good physical condition. If in good condition, it's a very good lens. I don't have any samples handy, but if you want, I'm sure I can dig some up. If you get a Vivitar S1 70-210, seriously get the Third version, the one with the 2.8-4.0 aperture. I have one each, of the first three versions and the third version is definitely the, all around. best one. The early model Minolta 35-70 3.5 is an excellent lens. The early model was made in a macro and non macro version. Some people say the macro version is the best and others say the non macro version is. My research showed more people saying the non macro was best. So, that's the one I got. First copy I bought turned out to have haze and fungus inside and was returned. The second copy I bought is in very good condition and is another one of my favorite lenses. It's a great lens. The Nikon 75-150 3.5 E series is another very sharp, great lens. One that you might consider, also, is the Tokina ATX 50-250 4.0-5.6. This lens is very sharp and covers a nice focal range. A lot of these old zooms have "macro" in their names, but really only allow closer focusing, to one degree or another. The Tokina 50-250, on the other hand, actually goes down to 1:1.2, which is closer than any of the 1:2 dedicated macro lenses. Once in macro mode, the focusing is a bit fiddly, but with a little practice, it's not too difficult. Also, most of these zooms tend to get a little softer at the long end but the Tokina doesn't. Actually, it seems to get sharper toward the long end. And, the dark horse is the Vivitar 28-200 3.5-5.3. It's still a sharp lens, just not quite as sharp as the aforementioned lenses. But it does produce sharp images with good color and contrast with little distortion and it covers a great focal range. I own all of these and I would recommend any of them, without hesitation. Again, the key is condition. Any of these could be dogs, if they are in damaged, abused or worn out Condition.
hex anon