Heliopan and other companies are now making "digital filters." These are infrared blocking filters needed for scanning back and other professional digital cameras.
Usually a scanning back will use one kind of bluish filter for daylight and another thickness of blue filter for tungsten lighting. BetterLight suggests you place these filters on the back of the lens, not on the front. The back of the lens is inside the bellows. I don't yet have an adequate system for attaching the large square filters to a round lens in an awkward position. You can use rubber bands but that seems rather primitive with a $12,000 scan back in a $2,000 camera with a $1,500 lens.
So hopefully the filter companies will develop a more intelligent manner of allowing studio and location photographers to attach the infrared filters.
Last updated August 12, 2001.