Astronomik L-RGB Filter

Parfocal design means that all filters in the set have the exact same optical thickness. You won't need to refocus your telescope when switching between the red, green, and blue filters during your imaging session.

While originally optimized for CCD sensors, these filters perform exceptionally well with modern CMOS astrophotography cameras. Their spectral transmission curves are designed to balance color reproduction effectively across both sensor types.

Because these filters are calculated for the sRGB color space, they are designed to produce natural, accurate colors right out of the gate. This significantly reduces the time you'll spend manually adjusting color balance in your processing software.

The correct size depends on your filter wheel and camera sensor size. If you are using a standard eyepiece holder, the 1.25" threaded option is common, but for dedicated filter wheels, you should match the filter diameter (31mm, 36mm, 50mm, etc.) to the wheel's specifications to avoid vignetting.

No, these are diffraction-limited optics, meaning they are manufactured to a high precision that prevents any degradation of your telescope's image quality. They are designed to maintain the sharpness of your optical system rather than introduce aberrations.