Chroma Filter

A blue filter is primarily used to enhance the contrast of planetary features, particularly the cloud belts of Jupiter and the polar caps of Mars. It is also highly effective for observing the rings of Saturn and can help highlight atmospheric details on Venus.

Parfocal means that you do not need to refocus your telescope when swapping this filter in or out of your imaging train. This specific filter maintains that focus consistency on telescopes with a focal ratio of f/4.0 or slower, saving you time during long observation sessions.

The transmitted wavefront rating of 0.25 waves/inch indicates the level of optical precision and flatness of the glass. A lower number signifies less distortion, ensuring that the light passing through the filter remains sharp and clear, which is essential for capturing fine detail in deep-sky objects.

Yes, the 50mm round shape is a standard size designed to fit most common filter wheels and slide-in filter holders. We recommend checking your specific filter wheel's documentation to confirm it accommodates 50mm round glass.

Parallelism refers to how perfectly flat and parallel the two surfaces of the glass are. A rating of less than 30 arcsec ensures that the filter will not introduce unwanted tilt or ghosting into your optical path, keeping your star images tight and free of aberrations.