The 70-300 is a 2 way, float pilot-valve that is designed for the control of the constant level control valves. The float pilot-valve will vent The float pilot-valve will vent or pressurize the control chamber of the main valve to open or to close, in direct proportion to the level changes.
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An Ode To The 70-200. by James Trent. Ever wonder why so many professional photographers use a 70-200mm lens? There’s a reason for this. Offering excellent image quality, fast autofocus, and an incredibly useful focal range, the 70-200 is a classic – the go-to lens for almost any type of shooting.
Telephoto zoom is designed for DX-format Nikon F-mount cameras and provides a 105-450mm equivalent focal length. One extra-low dispersion element greatly reduces color fringing and chromatic aberrations in order to produce greater clarity and color accuracy.
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