I posted a couple days ago about my older Sigma 400mm 5.6 AF prime lens i was having trouble with. But i really like the lens I know there are a couple differant models out there.
400mmAF5.6 prime
400mmAF5.6prime APO
400mmAF5.6prime APO HSM macro
These are all SIGMA lenes that they came out with it seems the first one on the list has a real problem with Sony Alpha's and the AF tends to strip out .
I have been looking at a used Sigma 400mm AF 5.6 APO At the local camera store for about 200 with a 30 warranty i was woundering if these have the same problems as the first 400mm sigma prime lenes.