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Astronomy > Filters > Nebulae filters > OIII Filters > Baader > f/2 Highspeed > Baader Filters OIII CMOS f/2 Highspeed 50x50mm
Product no.: 70919

Filters OIII CMOS f/2 Highspeed 50x50mm

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Product description

More about the series f/2 Highspeed...

OIII filtersonly allow light with a wavelength of 501 nanometres through. This corresponds with the spectrum lines fordouble ionised oxygen. These lines are emitted by planetary nebulae and some emission nebulae, so these objects remain visible whilst the rest is blocked out by the filter. This effect increases contrast and makes faint nebulae visible for the first time.

Astrophotography:These filters are best used with monochrome cameras. Ideally, images taken using these filters should be combined with images using H-alpha and SII filters. This creates an image which depicts faint nebulae clearly and with high-contrast.

Line filter with 6.5 nanometre half-width, recommended for extremely fast optical systems from f/3.4 to f/1.8, for example the Celestron RASA optics or other very fast astrographs.

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
Frames
Mount material
Aluminium
Coating of optical system
Reflex-Blocker™
Appropriate for...
f/3.4 - f/1.8
filter thickness (mm)
2
Filter Size (mm)
50 x 50

General


Type
Filters
Type of build
line filter
Series
f/2 Highspeed

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 f/2 Highspeed 50x50mm
Light transmission curve

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