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.