December 11, 2009, Newsletter Issue #56: Lumicon Deep Sky Filter

Tip of the Week

Light pollution filters, known as LPR filters for light pollution rejection, work by cutting out a spectrum of color. By selecting the LPR filter which blocks out a specific spectrum, you can see objects you would not otherwise, such as objects in deep space. The Lumicon Deep Sky Filter is one type of LPR filter. It works by blocking out the mercury vapor, high-pressure sodium vapor and low pressure sodium vapor lamp lights, neon lights, and airglow. The Lumicon Deep Sky filter allows the remainder of the visible spectrum through, allowing you to see deep sky objects such as star clusters and nebula you wouldn't otherwise see.

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