Lumicon Minus Violet Filters

Lumicon Minus Violet Filter for color or B&W photography

The Lumicon Minus Violet Filter greatly improves photographs taken through lens systems, producing pinpoint star images. It is especially recommended for all telephoto lenses. This filter is made from optically flat, specially-made colored glass, and has anti-reflection coatings on both surfaces. The Minus Violet filter passes the maximum amount of visible light, including the full blue, green, yellow, and red portions of the spectrum. It absorbs violet and ultraviolet light below 420nm, thus eliminating blue halos around bright stars in color photography. In B&W photography it eliminates bloated and swollen star images caused by violet and ultraviolet light which telephoto lenses cannot focus perfectly, due to chromatic aberration. The Minus Violet filter slightly reduces light pollution.

Recommended Films

All films can be used with the Minus Violet Filter; hypersensitized 2415 is the recommended B&W film available from any of Lumicon's authorized dealers.

Filter Factor

Increase exposure by only about 10% for the Minus Violet Filter.

For Viewing

The Minus Violet Filter can eliminate or greatly reduce the blue halo sometimes seen around stars in refracting telescopes. It is ideal for observing the moon and planets.