The Flag for Fujinon Duvo 25-1000 Box Lens attaches to the , allowing the flags to be used on the top and sides of the lens via built-in NATO Rails. The flags help prevent potential flare issues, allowing for more control of the end image. The flags include slide-out extensions that are controlled by a knob to either extend or retract the flags further.

Specifications:
Weight: 828 g (1.8 lbs)
Dimensions: 345 x 280 x 20 mm (13.58 x 11.02 x 0.79 in)