Filters for Astronomy

Space worthy

Characteristic features of astronomical filters include high imaging quality, precise and steep edges, space-qualified materials and large mechanical dimensions.

In addition to custom-made products, we also offer off-the-shelf variants such as Bessel Photometric variations or SDSS Photometric sets.

Specifications of typical astronomical filters:

• Wavefront aberration < ¼ per inch
• Wedge angle < 30 arcsec
• Flatness: ¼ per inch
• Surface finish: E/E defined according to MIL-C-48497A
• Reflectance typically < 0.5% to improve transmission and prevent ghost images
• Anti-reflective coatings