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Most useless photographic accessory

Those non-metered prisms they made for the Nikon F and F2.
It’s difficult to imagine abandoning the convenience of coupled TTL metering.

Not really....if you used Leica (M or LTM), Rollei, any large format cameras.......you're not afraid of using a hand held light meter. On top of that, the plain prism F & F2 just handle better.....