Great Blue Herons Require a Very Long Lens, at least in my backyard
re: The Most Useful and Practical Telephoto for Wildlife Might Be the Olympus M.Zuiko Digital ED 150-400mm f/4.5 TC1.25X IS PRO
re: Cropping a Full-Frame 35mm-Format Camera for Longer Reach, vs APS-C and Micro Four Thirds
Below, my shot today of a Great Blue Heron, with a very inadequate 100mm focal length om the Olympus ZUIKO SHG 35-100mm f/2 ED (100mm is equivalent to 208mm in 35mm format).
That’s why the Olympus M.Zuiko Digital ED 150-400mm f/4.5 would be so darn handy... that heron would fill the frame at the long end of the 150-400mm at its 400mm setting and with the built-in TC 1.25X, it offers 5X the magnification (25X smaller area) than the 100mm of the 35-100mm zoom.
Please use these links to buy, thank you.
Of course, context matters: sometimes you can get really close.