Baader O-III 8.5nm CCD Narrowband Filter

£239.00
SKU 2458438

Availability: Immediate Dispatch

  • Premium grade O-III 8.5nm filter for fast optical systems f/10 to f/2.8
  • For use with full frame / large format chip cameras
  • IR-blocked
  • NO halos, reflections or ghosting
  • non-ageing sealed coating edges
Description

This Baader narrowband 8.5nm O-III filter is for imaging deep sky objects that emit in O-III and is suitable for use with large format/full frame imaging cameras. 

Each individual filter is optically fine-polished to 1/4 wave and are hard coated. All Baader filters sport scratch resistant hard coatings which can be cleaned repeatedly throughout their entire lifetime as many times as needed - preferably with Baader Optical Wonder cleaning fluid.

Baader filters are individually made and not cut out of a larger plate-glass "master" (which is a typical manufacturing process for economy filters) as cut-out filters exhibit micro-cracks around all edges and capillary action between glass and coating layers will lead to premature ageing due to moisture deposition. All Baader filters have individual coating sealed edges, impermeable against ageing because the penetration of moisture is impossible.

Baader filters are continually tested to comply with MIL-specifications. One common test process is to boil the test specimen for one hour in salt water. Baader filters remained completely intact as opposed to filters drilled out of large glass plates.

Specifications
WEIGHT (KG) 0.087
TRANSMISSION RANGE O-III
FILTER THICKNESS (WITHOUT CELL) 3 mm
HBW (HALFBANDWIDTH) 8.5nm
CWL (CENTRAL WAVELENGTH) 502 nm
AR-COATING dielectrically coated, planeoptically polished
FILTER SIZE 50 x 50 mm / 65 x 65 mm
FILTER USAGE CCD, O-III
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE square

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