Baader f/2 Highspeed Narrowband Filter Set 31 mm H-alpha/OIII/SII

Baader f/2 Highspeed Narrowband Filter Set 31 mm H-alpha/OIII/SII – Product description

Baader f/2 Highspeed Narrowband Filter Set 31 mm H-alpha/OIII/SII is intended for applications in the Filter, Filter Wheels and Filterslider category. 31 mm Highspeed narrowband filter set with H-alpha, OIII and SII for extremely fast astrographs. The following information gives a detailed overview of equipment and use.

Key product details

• HyperStar and RASA astrophotography
• Very fast camera optics and astrographs
• H-alpha, OIII and SII narrowband projects
• Set of H-alpha, OIII and SII filters
• 31 mm filter diameter
• Optimised for approximately f/1.8 to f/3.5

Product overview

This Baader filter set was developed for the special requirements of extremely fast optics. At steep incidence angles, the effective passband of conventional narrowband filters shifts; the Highspeed design compensates for this effect.

Suitable applications

• HyperStar and RASA astrophotography
• Very fast camera optics and astrographs
• H-alpha, OIII and SII narrowband projects

Included equipment

• Set of H-alpha, OIII and SII filters
• 31 mm filter diameter
• Optimised for approximately f/1.8 to f/3.5
• Central wavelengths stated as 656.3 nm, 502 nm and 673 nm
• Dielectric coatings
• Plano-optically polished filters
• Filter thickness approx. 2 mm

Why special f/2 filters?

With very fast optics, light reaches the filter at steep angles. A specially tuned Highspeed filter keeps the desired emission line better centred within the transmission band.

Practical note

These filters are optimised for fast systems. On much slower telescopes, check whether a conventional narrowband set is the better match.

Selection note

Related products: Telescope accessories at Optikshop24.