Penguin colony, Half Moon Island, Antarctica

Very nice, crytal clear and majestic. Amazing when I see that you had used a 7D II + 150-600mm Sigma lens .  TFS!

Thanks Tm J - the Tamron 150-600mm lens is a great travel lens, especially with the weight restrictions from the airlines. It is not quite as sharp as a telephoto prime lens and is definitely slower to focus, but stopped down to f/8 you can get some great results. There were a lot of atmospheric thermals which caused some distortion, even on the close rocks, but it is clearly visible in the distant mountains; even the finest lens can't fix that!