Hello everyone I'm looking for some advice on which lens is the best for me to purchase out of the Tamron SP 150-600mm F/5-6.3 Di VC USD And the Sigma 150-600mm f5.6-6.3 DG OS HSM For my canon 600d, I mainly photograph aircraft ( well try anyway ) I've also started to take an interest in wildlife photography mainly flying birds, I current have a canon 100-400 mm lens which has served me ok but I'm wanting more reach, so which lens would you recommend I should buy, I appreciate everyone's time and responses. Also if any one could recommend some settings I should use as I'm still getting used to getting the best out of my camera, would it be best to sell my canon lens after I purchase or should I keep, Thankyou everyone
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