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Baader UBVRI Bessel Filters – Photometric

SKU FBES-1U (Baader #2961750U)
Original price $163.00 - Original price $3,449.00
Original price
$163.00 - $3,449.00
Current price $184.00
Filter Usage: U
Filter Size: 1 25 inch

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“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

Limited-Lifetime-Warranty for CMOS-optimized Baader filters

A Baader Planetarium exclusive. Filters incorporating Baader Planetarium’s Life-Coat™ technology are so durable that Baader Planetarium warrants the coatings for the life of the filter. Baader Planetarium has developed Life-Coat™ using materials and processes that result in coatings which will not degrade or fail for a lifetime. Life-Coat™ coatings resist moisture, temperature extremes, and are hardened to withstand normal cleanings.

Baader Planetarium guarantees their Life-Coat™ coatings will not peel, flake or physically degrade and will withstand repeated cleaning with fine optical cleaning equipment. The Limited Lifetime Warranty applies to the original purchaser and does not cover failure from mis-use, physical damage through improper handling, or improper cleaning.

MANUFACTURER Baader Planetarium
TRANSMISSION RANGE Transmission according to Bessel
AR-COATING Reflex-Blocker™ hard coated, planeoptically polished
SPECIAL FEATURES Life-Coat™ Warranty
FILTER SIZE 1 25 inch, 2 inch, 31 mm, 36 mm, 50.4 mm, 50 x 50 mm, 65 x 65 mm, 100 x 100 mm
FILTER MOUNTED Mounted (LPFC 6mm) / Unmounted
SINGLE OR SET? Single and Filterset
FILTER SHAPE round or square