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OPTOLONG 1.25" H-Beta 25nm Telescope Filter Enhance for Visual Observation CO
Main Use and Performance:
- Use with a large aperture telescope under clear and dark viewing conditions with good seeing
- Suitable for viewing on the faint and elusive Horsehead Nebula and California Nebula
- Narrowband filter do not eliminate the effects of light pollution or increase the object's brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.
- WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.
- Multi-layers anti-reflection coating
- Non-cementing optical substrate coating
- Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change
- Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band
- Ultra-thin filter cell minimize vignetting by maximize possible clear aperture (clear aperture is 45mm )
- Aerometal Material | Precise CNC Machining | Sand Blasting Process | Black Anodized Finish | Extinction Treatment to Prevent Reflection | Laser Engraving No Fading
- 1.25" OPTOLONG H-Beta 25nm Filter
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On Sep-21-19 at 01:28:22 PDT, seller added the following information:
Filed under: Eyepieces & Accessories