I know the 200/2 and 800/5,6 lenses needs service by Canon for the IS if you bought the 5D3. I bought the 1DX a few weeks ago. But I'm staying in Bangkok a few months and my 200 & 800 lenses are in Sweden. Do they work in the 1DX or is it the same as with the 5D3
grabbed my 200 f/2 to local camera shop to play with 1dx last week... no issue with IS. never got my lens sent in since I returned the 5D3 to purchase 1D4. 800.... I can only dream.