Chroma Filters

Being parfocal means that once you achieve focus with one filter, you won't need to refocus when switching to this Green filter. This design is optimized specifically for telescopes with a focal ratio of f/4.0 or slower to maintain that consistent focus across your imaging session.

These are 36mm round filters designed for standard filter wheels or drawers that accommodate this specific size. Please verify that your filter wheel or mounting hardware is compatible with 36mm round glass before purchasing.

A transmitted wavefront better than 0.25 waves/inch indicates high optical precision. This ensures that the light passing through the filter remains undistorted, resulting in sharper, clearer images without introducing aberrations.

Parallelism refers to how flat and uniform the two sides of the filter glass are. A rating under 30 arcseconds ensures that the light rays remain aligned as they pass through, preventing unwanted image shifting or ghosting in your final capture.

Yes, the combination of high optical clarity and strict manufacturing tolerances makes these filters well-suited for high-resolution work. They are engineered to maintain image integrity, which is essential for detailed astronomical photography.