Filters H-Beta CMOS Narrowband 1.25"

H-beta filters: This narrow-band nebulae filter allows light with a wavelength of 486 nanometres to pass through.

Line filter with 5.5 half-width, recommended for optical systems with an aperture ratio of f/15 to f/1.8.

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.