Baader UBVRI Bessel Filters – Photometric

“The filters worked exceptionally well and we got terrific images post-impact. We couldn’t have done it without your help, and we are very grateful! Such an exciting and successful mission to be a part of (and lots of observing work).” - Magdalena Ridge Observatory (MRO) Director

Read more about how NASA Hazardous Asteroids research used large Baader Bessel filters to successfully image DART impact with the MRO 2.4-meter telescope

Key Features

• Baader Bessel-UBVRI Bandpass Filter Set, suitable from f/15 to f/1.8
• Classic photometric filters 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

The new generation of Baader CMOS-optimized filters features:

• Reflex-Blocker™ coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
• Identical filter thickness to existing standards, 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 read more)
• Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment