ALFBESRD31R

FBES-RD31R

Alpine Astronomical

This 31mm Round, Unmounted Baader UBVRI Bessel R Filter, from Alpine Astronomical is a classic photometric filter with transmission according to Bessel and parfocal with all Baader filters of the same size. This daylight-proof filter uses ion-beam coating technology and features a Reflex-Blocker hard coating, which has been planeoptically polished, and has Life-Coat sealed coating edges. It is equally suitable for modern CMOS sensors as well as for older CCD camera technologies.None Reflex-Blocker coatings offer largest ever freedom from halos, even under most adverse conditions concerning aux-optics Identical filter thickness to existing standards (2mm), with utmost care for parfocality Blackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter Each filter coated individually, with sealed coating edge (Not cut out of a larger plate with coatings left exposed) Life-Coat: evermore hard coatings to enable a non-aging coating for life - even in a most adverse environment