50 x 50 mm x 3 mm Baader UBVRI-U Bandpass Filter, suitable from f/15 to f/1.8. Classic photometric filter with transmission according to Bessel – parfocal with all Baader filters of the same size. Manufactured with most advanced ion beam coating technology / Daylight-Proof. Reflex-Blocker™ hard coated and planeoptically polished – with sealed coating edges (Life-Coat™). Blackened edges all around, with filter-lead-side-indicator in the form of a telescope-sided black outer rim. Equally suitable for modern CMOS cameras as well as for older CCD camera technologies.