Lumicon Minus Violet Telescope Filters

Catalog description

Lumicon Minus Violet Telescope Filters, part number LUMI011, is a discontinued product from the 2007–2011 catalog. It was last listed at $47.00, down from a high of $63.96.

Lumicon Minus Violet Filter for color or B&W photographyThe 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 FilmsAll 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 FactorIncrease exposure by only about 10% for the Minus Violet Filter.

For ViewingThe 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.

• Filters
• Telescopes