Don Sanderson escribi�:
Has anyone ever met the AF Sigma 75-200mm f/3.8?
Seems pretty uncommon but then Sigma's made about ten zillion different lenses. I have a 35-135/3.5-4.5 from the same era and it's pretty decent. This one's in the Speed/FL/Price range I'm looking for, but I've had some pretty c**ppy Sigmas.
Don, my brother has one of those, and I had it on "extended loan" some time ago. It is a good lens, build wise is a "trombone" type of zoom, well built for a Sigma. The nice side of the lens is the 3.8 constant aperture, and it seems to go for cheap prices nowadays in Ebay.
Comparing it to the other telezooms I have or had (F 70-210 4-5.6, FA* 80-200 2.8, FA 80-320 and a pair of manual focus Vivitars) I can say that in contrast and sharpness it isn't in the same class than the Pentax telezooms, but it is a good lens for the price and no worse than the best of the two Vivitars I had. It flares more than both the Pentaxes and Vivitars, but not too much.
The only quirk I have found in this lens, and it shares this electronic bug with the Sigma 24 2.8 AF and 400 5.6 AF I have also used, is when you use it out the "A" position of the aperture ring the aperture readings in the viewfinder change randomly. I mean, you have the aperture ring of the lens in, say, 5.6, and the reading in the viewfinder is 6.7, then you close it half a stop further, and it says 8 when it should be 6.7 this time. You open half a stop and now it says 5.6, the same thing that you can see in the aperture ring. This behaviour is unpredictable, and it happens whenever you use the aperture ring out of the A position. In the 400 mm. 5.6 the only mistaken aperture was f:32, which appeared as 22 in the viewfinder.
This problem doesn't have ill effects in the exposure, at least in my limited experience with this lens (the 75-200 3.8).
