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The Alphatron Broadcast Electronics 4 x 4 Clip-On Matte Box allows you to use 4 x 4 filters when shooting with lenses that feature a front outer lens barrel diameter of 114mm without requiring the use of support rods. This allows you to shoot using available 4 x 4 filters without the extra weight of a rod mounted matte box system. The matte box features two filter stages, one that is fixed and one that is fully rotatable. The matte box features small thumbscrews that lock the filter tray into the stage, useful for setting the vertical position for grad filters.
The matte box includes a removable eyebrow (top flag) that attaches to a lockable hinge, which allows you to set the position of the flag and lock it in place. It also incorporates adjustable internal top and bottom flags, which can be used to block protect the lens from flares. A side flag kit is available to provide additional flare protection and available step down adapter rings allow you to use this matte box with select lenses that are smaller than 114mm.
2 x filter stages with filter locks for setting filter height. 1 x rotating filter stage allows you to adjust the filter, which is useful when working with graduated or polarizing filters.
The built-in eyebrows are adjustable, allowing you to control glare, flare, and reflections without using external flags, keeping the matte box small and compact.
The included removable top flag attaches to the top of the matte box via the lockable hinge that allows you to precisely set the position of the flag and lock it so that it does not move during the shot.
Please note that clip-on matte boxes work best with lenses that feature an internal focus mechanism, so that the front of the lens does not rotate as the lens is focused. Most modern prime and zoom lenses feature this construction.