alpine marmot, Nikon D3, Sigma APO 500mm F4.5 EX DG HSM
flickr.com © DUELL
il riposo dei principi, Nikon D3, Sigma APO 500mm F4.5 EX DG HSM
flickr.com © DUELL
Autumn 2017, Nikon D800, Sigma APO 500mm F4.5 EX DG HSM
flickr.com © kim kovac
Autumn 2017, Nikon D800, Sigma APO 500mm F4.5 EX DG HSM
flickr.com © kim kovac
bison crossing, Nikon D3, Sigma APO 500mm F4.5 EX DG HSM
flickr.com © DUELL
stambecco portrait, Nikon D3, Sigma APO 500mm F4.5 EX DG HSM
flickr.com © DUELL
lu piccolo alle prime, Nikon D4, Sigma APO 500mm F4.5 EX DG HSM
flickr.com © raffaele di martino
giovane rosso in cattura!!, Nikon D4, Sigma APO 500mm F4.5 EX DG HSM
flickr.com © raffaele di martino
Red-necked Grebe, Nikon D800, Sigma APO 500mm F4.5 EX DG HSM
500px.com © Ramasubramanian Narasimhan
Untitled, Nikon D800E, Sigma APO 500mm F4.5 EX DG HSM
500px.com © 艺 梁
Daurian redstart  (male), Nikon D7000, Sigma APO 500mm F4.5 EX DG HSM
500px.com © Kensaku Kawasue
avocette, Nikon D4, Sigma APO 500mm F4.5 EX DG HSM
flickr.com © raffaele di martino
zmir yal apk n, Nikon D300S, Sigma APO 500mm F4.5 EX DG HSM
500px.com © sacit bulut
Rough legged buzzard, Nikon D500, Sigma APO 500mm F4.5 EX DG HSM
500px.com © Kensaku Kawasue
Untitled, Nikon D800E, Sigma APO 500mm F4.5 EX DG HSM
500px.com © 艺 梁
Untitled, Nikon D800E, Sigma APO 500mm F4.5 EX DG HSM
500px.com © 艺 梁
Fall (Bald Eagle), Nikon D7200, Sigma APO 500mm F4.5 EX DG HSM
500px.com © Scott Keys
Petronia petronia, Nikon D300S, Sigma APO 500mm F4.5 EX DG HSM
500px.com © sacit bulut
Rough legged buzzard, Nikon D500, Sigma APO 500mm F4.5 EX DG HSM
500px.com © Kensaku Kawasue
Northern harrier, Nikon D500, Sigma APO 500mm F4.5 EX DG HSM
500px.com © Kensaku Kawasue
Northern harrier, Nikon D500, Sigma APO 500mm F4.5 EX DG HSM
500px.com © Kensaku Kawasue
Short-eared owl, Nikon D7200, Sigma APO 500mm F4.5 EX DG HSM
500px.com © Ben Hellebaut
Northern harrier, Nikon D500, Sigma APO 500mm F4.5 EX DG HSM
500px.com © Kensaku Kawasue
Knife pass, Nikon D300, Sigma APO 500mm F4.5 EX DG HSM
500px.com © Sebastian Fernandez Bielkiewicz
Gold cock, Nikon D7200, Sigma APO 500mm F4.5 EX DG HSM
500px.com © Ben Hellebaut
Dusky thrush, Nikon D500, Sigma APO 500mm F4.5 EX DG HSM
500px.com © Kensaku Kawasue
Golden Fog Canada Geese, Nikon D7200, Sigma APO 500mm F4.5 EX DG HSM
500px.com © Scott Keys
Goshawk, Nikon D7200, Sigma APO 500mm F4.5 EX DG HSM
500px.com © Ben Hellebaut
Northern harrier, Nikon D500, Sigma APO 500mm F4.5 EX DG HSM
500px.com © Kensaku Kawasue
P.p. rosaceas, Nikon D500, Sigma APO 500mm F4.5 EX DG HSM
500px.com © Kensaku Kawasue