I have been reading Brad Hills blog for awhile now. I really like his writing style and his in-depth knowledge of his subjects.
One of his series of blog posts has really caught my attention of late... his comparison of the Nikkor 500mm f4 and the Sigma Sport 500mm f4.
Today I thought I would share his final post on the subject and what his conclusions are.
Check out this link and see what the findings were in his comparison. http://www.naturalart.ca/artist/fieldtests/500mmwars_sigma_nikon.html
It defiantly helped me make up my mind on which 500mm f4 I would like in my bag.