Hello all! I just purchased a Tamron 150-500mm lens today and am still having trouble shooting birds and other animals from a relatively short distance. I am shooting around 400 to 600mm and the quality of the shots is still very amateur and subpar at best. Am I missing something here? Perhaps a setting, technique, etc? I am shooting in low light today with grey skies, etc. and the image is just not clear. Colors are distorted and there is a defining outline to my subjects. I am very new at still photography but am hoping I made a good purchase of a lens for my T5i canon. Any help or tricks, etc. would be much appreciated as I am leaving for a short vacation to an island with lots of wildlife especially gators and shore birds. Thank you kindly!