When I used my dear departed Fuji S-2 to photograph subjects on white backgrounds, I'd wind up with soft translucent red areas in the center of the finished photos. I figure the spots were generated by light bouncing off the face of the sensor, onto the back of the lens, and then back into the photo receptors. (I've never read another explanation for this behavior, so if anybody knows better, I'd be interested to hear from you.) The problem was bad enough that I had to sell a couple of lenses for which the problem was especially bad. (Nikon 50mm,f.1.4, Tamron 90mm,f.2.5)
Now I'm using a Nikon D-700 and thinking about finding another Tamron 90mm. Does anyone know whether the red-spot problem has been licked, at least with my current camera? Or should I continue to steer clear?
Thanks, MB