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Astronomy > Filters > Nebulae filters > OIII Filters > Baader > Narrowband > Baader Filters OIII CMOS Narrowband 36mm
Product no.: 70860

Filters OIII CMOS Narrowband 36mm

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Product description

More about the series Narrowband...

OIII Filter: The narrowband O-III 3nm filter is designed for nebula observation allowing 3nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission lines, blocking out all other light.

Line filter with 6.5 nanometre half-width, recommended for optical systems from f/10 to f/3.5

Baader's CMOS-optimised filters are characterised by:

  • increased contrast
  • narrower half-widths (FWHM)
  • Reflex Blocker™ coatings for maximum insensitivity to retro reflection from nearby auxiliary optics, even under the most adverse conditions
  • FWHM carefully designed for each filter category to enable 1:1:1 exposures, matched to typical CMOS quantum efficiency and signal-to-noise ratio
  • Identical filter thickness to existing standards, with the utmost care taken to ensure homofocality
  • Blackened edges all around, with filter front indicator in the form of a black outer edge on the front to additionally prevent any reflection from light falling on the filter edge
  • Each filter is individually precision-polished and coated, with a sealed coating edge (NOT cut from a larger plate with exposed coating edges)
  • Life-Coat™: even harder coatings to enable an age-resistant coating with an unlimited service life – even in the most adverse environments

This new CMOS-optimised filter generation is designed to become the new standard in amateur astronomy.

Specifications

Capacity


Central wavelength (nm)
500,7
Half-value width (nm)
6,5
Frame
ring
Mount material
Aluminium
Coating of optical system
Reflex-Blocker™
Appropriate for...
f/10 - f/3.5
filter thickness (mm)
2
Filter Size (mm)
36

General


Type
Filters
Type of build
line filter
Series
Narrowband

Area of application


Useful for photographs
yes
Visually useful
no
Twin stars
no
Moon & Planets
no
Nebulae & galaxies
yes

Product safety

Manufacturer: Baader Planetarium GmbH, Zur Sternwarte, 82291 Mammendorf, DE, www.baader-planetarium.de
Baader Filters OIII CMOS Narrowband 36mm
Light transmission curve

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