Optolong narrowband filters

High quality filters with 7nm or 12nm bandwith. Good price/quality ratio.

Product variants

More about the product

These filters are intended for CCD applications.

Filter Specification:

H-Alpha: CW 656nm, 12 or 7nm bandwidth
O-III: CW: 500nm, 12 or 7nm bandwidth
S-II: CW: 672nm, 12 or 7nm bandwidth
These filters are not suitable for solar observations.


Technical specifications

Supporting glass of Schott
Surface Quality 60/40 (corresponding to the EE kindness by American military standard MIL-O-13830)
Fine optically polished, 1/4 wavefront
min. 90% peak transmittance in the passband
IR Blocking 700-1100nm in the stop band / off band

Coating properties:

High Homogeneous multilayer anti-reflection coating
The allowances are not cemented to the optical carrier, but applied Deposition (IBAD) method by electron beam evaporation and subsequent ion beam assisted.
This special process allows a high durability and scratch resistance, and high stability of the center wavelength (CWL) and prevents a temperature drift.
High transmission in the passband, high optical density in the stop band.

Filter version:

Ultrathin filter mount for maximum passage: 26mm at the 1.25 "filters, 45mm at the 2" filters
Precise CNC manufacturing
Sandblasted
Black anodized
blackened to reflections
Laser engraving - no fading of the label

Customers from GERMANY: Please note we are not allowed to ship the EOS clip filters to Germany.

Astronomical telescopes up to 100 Euros
Astronomical telescopes between 100 and 200 Euros
Microscope offer up to 200 Euros



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