Introduction High-speed telephoto lenses like these two are designed to offer the very highest image quality but they’re somewhat pricey and restricted to specialist use. Where once the 300mm was the most popular, the 400mm is, arguably the most flexible in the range (especially when used with tele-converters with the aim of maintaining autofocus) and therefore the most sort after today. Both models share a number of similar features including three ED glass elements, Nano Crystal Coat and an ultrasonic type AF motor. Both models also feature the latest 4-stop VR II spec image stabilization and
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