I purchased a used 70-200 from Adorama this past weekend
While using it I noticed a couple of things:
1: Sometimes, the lens will not stop down the aperture...for example, I'll dial in f11 but lens will stay open at around 4.5. Resulting in overblown pictures...
Reseating the lens *sometimes* works.
sometimes this will solve it, or the lens throws up ERR01
2. I know there is to be some degree of softness/CA at f2.8...but shouldn't these issues be going away by say...5.6?
I test drove the lens at an outdoor (very bright sunlight) event after purchase, and the aperture issues started to drive me up the wall. I put it back in the bag and used my 28-70 f2.8L for the rest of the day with nary a hiccup.
any thoughts? Or should this one go back to Adorama for a refund?
Incidentally, how long does it usually take Adorama to refund the money?