Some people are whingeing in other threads about the sharpness of the Sigma 150-600mm C based on a chart from TDP. Yesterday, I took out the lens with my 5DSR and tried it with the 1.4xTC at 840mm at a reserve where the birds are usually too far away. I was gobsmacked with the results. I was photoing an arctic tern about 60m away, with the others in the hide using their spotting scopes to see the far away birds, when it was photobombed by mummy tern with food for junior.
These are crops. Mummy is entering the frame at the top right corner, as far away form the centre as possible, (where junior is). The corner is sharp at 840mm! Junior has been fed a second later in the lower frame.
These are crops. Mummy is entering the frame at the top right corner, as far away form the centre as possible, (where junior is). The corner is sharp at 840mm! Junior has been fed a second later in the lower frame.
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