Baader UBVRI Bessel I filter 31mm

Baader UBVRI-I bandpass filter, suitable from f/15 to f/1.8; Classic photometric filter with Bessel transmission range ? parfocal with all Baader filters of the same size; Manufactured with state-of-the-art ion beam coating technology / Daylight-Proof; Reflex blocker hard-coated and plano-optically polished ? with sealed coating edges (Life-Coat); Blackened edges all around, with filter front side indicator in the form of a telescope-side black outer edge; Equally suitable for modern CMOS cameras as well as for older CCD camera technologies