So, the new-to-me 300 f/2.8L had not been properly calibrated-by-duck since I got it a few weeks ago.
My drop-in polarizer came the other day, so I headed to the pond.
A couple of things: I'm pretty darned lousy at BIF, and besides that, somebody is no doubt going to tell me thems ain't ducks !
Well too bad....I figure they're fowl and what I lack in quality I made up for in quantity. 
Consider the lens properly broken in now.
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.. even if it's diificult with small pictures to appreciate I like the results ..
, my 5DMKII'electronic is almost lost and image becomes really dark, sharpness seems to be very far from the standard filter
...
.. probably, I don't know how to use it correctly 

