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Wider F-stop (4.5) means bigger lens opening, which means can shoot in lower light level. Also means glass lenses are bigger so costs more than the 600 mm lens. I use 600 for outside sports as well as bird pics that are well lit, and needed longer range than the 400 offered.
Sorry, there was a problem. Please try again later.Cause of the lens quality. Gmaster lens are more pricey than other Sony lens.
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