Upload & Sell: On
Supertelephoto lenses appear to fail seldomly, and they take all kinds of physical abuse, yet many of those beat up derelicts, you can see on ebay, keep on functioning.
Judging by numerous nicks, dents and paint loss on the barrel, bent/fractured hoods and lens front lips, cracked distance windows etc., such lenses must have had a rough life in the hands of some photographers. For example, people have witnessed heavy telephoto lenses tossed by their owners into car trunks as if they were sacks of potatoes.
Yet, ocasional failures do happen, and I have heard of a number of people who have lost their 300 f/2.8 non-IS and 400 f/2.8 non-IS lenses because a replacement for the failed part could not be found. The legendary 200 f/1.8 fails here and there too, and sometimes in a most unusual manner: an FM member might have lost his 200 f/1.8 due to a doublet lens element bond separation. He has gone thru some hoops trying to have that fixed, and I am not sure if he has ever succeeded.