03-13-2013, 05:01 PM
When IS lenses started to appear I wondered about IS decentering as well as a drop in resolution,also I noticed that IS versions the Tamron 17-50 were a stop behind over the non IS versions and others. But since then I've heard no more and assumed that over the course of time these problems had been overcome,evidently not. This now leaves us with three sources of lens problems,AF and two sources of decentering.
One recent cause of yet another problem from IS on the Nikon forum( I think it's on the 24-70),at long exposures of several minutes a red stripe is left on the image even when the photo is taken in complete darkness,it turns out that it is caused by an IR LED used in the IS system.
One recent cause of yet another problem from IS on the Nikon forum( I think it's on the 24-70),at long exposures of several minutes a red stripe is left on the image even when the photo is taken in complete darkness,it turns out that it is caused by an IR LED used in the IS system.