I'm looking to buy a longer and faster lens. I'm using the Nikon 80-400 and want more length and a faster focus. I can't afford the Nikon 200-400 or 500 so I'm considering the Sigma 150-500 mm f/5-6.3 DG OS HSM APO AF. Is this lens a good choice or should I keep putting money in my piggy bank and hold out for the Nikon lens? Thoughts?







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