By Nandagopal Rajan
I have been using a Canon EF 75-300mm lens for many years now. It gives you great shots even though the low light performance is not all that great. This is why I jumped on the opportunity to review the Sigma 150-600mm f/5-6.3 DG OS HSM lens. While I was not sure about the aperture value, the excitement of using a 600mm lens in migratory bird season got me pumped up.