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Originally Posted by Tobyh  Ok now I am confused  how could this happen if it's meant to be compatible? Are you speaking from experience here Nightshade>? It's something I just would never have even thought about! |
It's quite common. On the Sigma 50-500mm, you can't use the converter at the 50mm end, because the glass hits the rear lens! Mind you why you would want to use it at 50mm is another question! You do have to be careful though when it's fitted as if you try and lock the zoom, again it'll hit the rear lens, just be careful with whatever lens you use one with.
