I bought this 1.4 teleconverter to use with a 400mm lens. Maybe I need to work with it more to get used to using it, but I think I lose quite a bit of sharpness with this teleconverter on my L lens, as the lens by itself is very sharp. I actually orderred this converter thinking it was the better one. I almost sent it back, but waited too long to do so. My opinion is get the better one, or get one made by the lens maker.
Verified purchase: Yes | Condition: New
Clean and good condition.
Verified purchase: Yes | Condition: Pre-owned
great item
Verified purchase: Yes | Condition: New
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