popo wrote:
I just looked it up again to make sure, the only Canon 70-200 lens that doesn't have sealing is the f/4 non-IS. All the other 4 do including the two mentioned.
I, too, thought that the 70-200mm 2.8 without IS has no weather sealing.
Googling for it I found that Wikipedia page that says the same thing:
http://en.wikipedia.org/wiki/Canon_EF_7 ... 200mm_lens
So I'll still believe Canon 70-200 + IS = weather sealing / no IS = no weather sealing. The IS alone can't make such a difference in price.
So if I had to choose between those lenses I'd go for the used 70-200mm 2.8 L IS USM. The 70-200mm non-IS will be used in a short time as well so personally it doesn't matter to me if I buy used or new. I'd only go for a new lens if the used prices are not much lower.
Weather sealing + IS is pretty nice. The Sigma is OK but if it costs the same as the Canon version I'd stay with Canon.
I thought of the Tamron version which is much cheaper and sharper than the (old) Canon version just having a worse focussing motor.