ALFBESSRD31

FBESSET-RD31

Alpine Astronomical

This Baader UBVRI Bessel Filterset, from Alpine Astronomical, includes all five UBVRI photometric filters.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