Zhumell Astronomical Telescope Filters - 1.25 in #23A Light Red Filter 125-23A-LRED are the perfect way to enhance astronomical viewing. Compatible with any standard 1.25" format eyepiece, 1.25" Astronomical Zhumell Filters help to bring out contrast in astronomical objects. Color Astronomical Zhumell Telescope Filters work by blocking out certain colors in the visible spectrum of light.
When using 1.25 in. Zhumell Filters, make note of the visible light transmission
(VLT) of the filter you would like to use. The VLT is a number which describes the overall amount of light which is allowed to pass through the filter. The lower the VLT number, the dimmer an image will appear.
1.25" Zhumell #23A LIGHT RED Filter (1.25-23A-LRED) - 25%VLT: 1.25 Inches Light Red Zhumell Filters #23-A help to make Mercury and Venus stand out from the blue sky when viewed during the day. Used in large telescopes, Light Red #23 A sharpens boundaries and increases contrast
on Mars, sharpens belt contrast on Jupiter, and brings out surface detail on Saturn.