Astronomik Luminance Filter

A luminance filter acts as a clear window that blocks ultraviolet and infrared light while letting the entire visible spectrum pass through. It is used to capture the 'detail' layer of an image, providing the sharpness and contrast that color data often lacks.

Yes, this filter is specifically designed to minimize the bluish halos often seen around bright stars when using refractors with imperfect color correction. By blocking the UV and IR wavelengths that refractors struggle to focus, it tightens star profiles and improves overall image clarity.

Homofocality means that the filter is manufactured to a precise thickness so that you don't have to refocus your telescope when switching between this filter and others in your set. It saves you significant time during imaging sessions by keeping your focus point consistent.

This filter is primarily designed for monochrome cameras, where you are building a color image by combining separate luminance and RGB exposures. If you are using a one-shot color camera, you generally do not need a luminance filter, as your camera already has an internal UV/IR cut filter.

Astronomik uses advanced, highly durable coatings that are designed to resist scratching and degradation over time. More importantly, these coatings are engineered to eliminate internal reflections and halos, which are common issues in lower-quality filters when imaging bright stars.