Testing a Canon Super telephoto loaner lens on Eagles and Birds

I had fun recently.  I am a member of Canon’s CPS program- Canon Professional Service.  
This entitles me to try almost anything Canon makes for 10 days.
So, I thought I’d try the EF 200-400mm f/4L IS USM Extender 1.4x.

The lens is a beast.  It is very sharp but that comes with some negatives- size and price.

Weighs almost 8 lbs and cost $10,000  For more info on lens:

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