Sony and Nikon Built the Same Bird Lenses, So Which One Do You Pick?
Sony's new 400mm f/4.5 and 600mm f/6.3 primes come in lighter and cheaper than the Nikon lenses they closely resemble, and that puts a real decision in front of anyone who shoots birds and wildlife. Long glass is usually the most expensive and physically demanding part of a wildlife kit, so a few hundred grams and a four-figure price gap can shape what you carry for years.