Astronomik L-1 UV-IR Cut Filter

The L-1 is a luminance filter designed to block ultraviolet and infrared light while allowing visible light to pass through. It is used in astrophotography to capture sharp, high-contrast detail for the luminance channel of your images.

No, you shouldn't need to. The L-1 features a parfocal design, meaning it is engineered to maintain the same focus point as other filters in the Astronomik series, allowing for seamless transitions during your imaging sessions.

This filter is specifically optimized for optical systems that are already well-corrected for chromatic aberration, such as reflector telescopes. If you are using a refractor, you might consider the Astronomik L-2 or L-3 filters, which are better suited to manage the specific aberration characteristics of those systems.

The MFR coating is designed to be scratch-resistant and highly effective at suppressing internal reflections and halos. This ensures that bright stars remain clean and sharp without creating unwanted artifacts around them, preserving the detail in nearby nebulae or galaxies.

This is a 50 mm diameter filter with a glass thickness of 1 mm and a total mechanical thickness of 3 mm. Please ensure these dimensions are compatible with your specific filter wheel or drawer system before purchasing.