Reach is the king when it comes to wildlife photography. I would vote for 400mm prime as it is just the right focal length for mammals. Any piece of glass between the sensor and the lens will lead to slight degradation in IQ and AF performance. I own both 600mm and 300mm primes and I can vouch for bare 300mm. It is incredibly fast and ridiculously sharp when used bare. Images with 1.4X tele are still good but you lose a stop of light. If that doesn’t matter to you much, then 300mm saves a lot of money.
PS: Primes should be silent/near silent while focusing. If the motor noise is squeaky or higher than near silent, then I would suggest to stay away from it. It might be a faulty motor.
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This reply was modified 5 days, 4 hours ago by
Shamim Azam.
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This reply was modified 5 days, 4 hours ago by
Shamim Azam.