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Hi Tony
I purchased the 400mm prime specifically for bird photography and in the couple of months I have used it, mostly it has been too short! A 500mm would have been better!
It was a tough choice between the flexibility of the 100-400mm and the 400mm prime but when I reviewed how I have used my 70-200mm zoom, I noticed that 99% of the photos were taken at the 200mm setting, so I used this to help me decide on the 400mm prime.
I saw a 100-400mm zoom at the Qld Astrofest and it looked bigger and heavier compared to the 400mm prime – I haven’t checked the specs, this was just a visual impression.
I figured that when shooting birds in flight, IS may not be as important given that the 100-400 does have IS.
Cheers
Dennis
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