I am still going through images that I shot on Photo Trips that I did not get to while I was still working. These are from a trip to Florida a couple of years ago. The images were taken at the St. Augustine Alligator Farm Rookery. I was using a Tamron 150-600mm lens on a Canon R. Both images here were @ 600mm. After using the Tamron lens for a while I am quite impressed with the quality of the images & versatility of this lens. Even with a 1.4x or 2x Teleconverter and processing images with Adobe Camera Raw you can get amazingly nice images of far distant birds & other subjects! Or portraits of closer birds. The Canon R would still autofocus even with the 2X Teleconverter. Plus the Tamron lens was easily hand holdable and no need for a tripod. Unlike the Sigma 300-800mm beast of a lens which was 13 lbs, so no handholding that lens for sharp images.
As I was photographing birds on nests at the St. Augustine Alligator Farm, this Roseate Spoonbill flew by overhead. The sun overhead was so bright that it really lit up the wings as it flew by giving a lot of detail in the wings and feathers.