Lee Big Stopper (100x100mm) brand_ROR The box claims that this

The box claims that this is for the Spectra System and that it "can also be used with Polaroid Impulse Cameras

Shutter speeds are good from 1/2s and up (1s is a touch slow) and the included Voigtlander Ultron 50mm f2 lens is free of haze or fungus

Ample room for movements with 4x5" and can cover 5x7" when stopped down

The lens included is a 28-80mm f3

Lee Big Stopper (100x100mm) brand_ROR The box claims that thisThe Lee Big Stopper is a 10 stop ND filter designed to fit a 100x100mm Lee filter holder or compatible. Neutral, high quality glass and a foam pad to prevent light leaks a well designed filter for long exposures. Requires a compatible filter holder (not included). In excellent condition, with carrying tin.