First look: Sony 400mm F2.8 G Master OSS
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First look: Sony 400mm F2.8 G Master OSS

Now that's a front element. You won't be able to screw any filters into the front of this lens, and curiously, unlike other super telephoto primes, it seems that while the Sony 400mm F2.8 will accommodate small drop-in filters in a tray near the lens mount, they're 'dropped-in' sideways (see the first image in this slideshow).