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I will be in rainforest of Peru taking bird pictures with the 500 f4 IS II handheld.  Any opinion as to need for polarizing filter for bird shots.  I have read that it is needed for landscape in rainforest. Thanks.

I use the Canon 500mm f4 IS II handheld and often walk several miles at a time.  I always carry a daypack and have tried various way of  utilizing the support of the pack to evenly transmit the weight across both shoulders.  Nothing seems totally sat...

I have 5D III with 500 f4.  I tried out for days in the field first without teleconter then with my Tamron 1.4x.  I did not notice any effect on autofocus. Effect on image quality is harder to assess. So my question is: 1). Anybody with experience be...

How do I tell if IS is working on my 500mm f4 IS II.  I cannot hear any sound from the lens when IS is turned on.  I have tried using live view while hand holding to see if image stabilizes shaking but nothing happens. Thanks in advance.