ALBUM EQ SHOP › Lee Filters 21" x 24" Sheet - 410 Opal Frost Image 1 of 1 Lee Filters 21" x 24" Sheet - 410 Opal Frost $12.95 A weak diffusion used for softening spotlight beam edges without altering shape. Stop Value 1/2. Quantity: Add To Cart Added! A weak diffusion used for softening spotlight beam edges without altering shape. Stop Value 1/2.