4 x 5.650" Smoque Filter +3 Give lenses more flexibility by

Give lenses more flexibility by allowing for closer focus and shallower depth of field

The rotating outer ring lets you choose how much contrast you need

Absorbs pollution in the Far Red (visible)

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Substitute or supplement typical theatrical smoke generators such as smoke cookies

4 x 5.650" Smoque Filter +3 Give lenses more flexibility byThe Tiffen 4 x 5. 65" Smoque Filter can be applied to simulate the presence of smoke within a frame or scene. It can be used to substitute typical theatrical smoke generators such as smoke cookies, chips, pellets, grenades, or aerosols. This filter can also be used to supplement the use of such smoke generators to help provide a consistent appearance of smoke, particularly if wind or other conditions prevent physical smoke from settling or staying