I have found the S1 70-210 F3,5 macro zoom to be an excellent lens.
While it provides 1:2.2 reproduction ratio, I would not use it for true macro uses due to two specific issues,
first, it has no tripod socket, and is a very heavy lens (about 2 pounds) to cantalever off the tripod socket on your body
Second, the lens suffers from zoom creep, due to the weight of the frond group.
Having listed the negatives, now lets look at the positives,
- it is a very sharp, fast f3.5, and easy to use lens,
- The focusing is at the ideal ratio, in terms of speed and precision, with 180degrees of focusing collar rotation from minimum focus to infinity. this is , in my opinion the best trade off between precision, whre you want very gradual change in focus relitive to the movement of the collar, and speed, for changing distance.
- The lens is a true zoom, which means focus does not change when you zoom in and out
- as a one ring zoom it is easy to track and reframe and shoot, because one hand can be on the collar the other on the shutter.
- it is constant apature, which makes flash photography easier
WHile it can do macro it also works well for other more typical close ups such as flowers, and with a DSLR is a great lens for larger wildlife.
There are a couple of minor inconveniences, such as lack of a lens hood, and the fact that the front group rotates for focusing making polarizing filters a little ore difficult to use, but not impossible
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