Optolong Moon and Sky Glow Filter 1.25"

Optolong Moon and Sky Glow Filter 1.25"

The Optolong Moon & Skyglow filter is designed to darken the background sky by blocking light transmission from skyglow at 589nm and many street light emissions from artificial light. Its high efficiency preserves image brightness, reveals more detail and increases contrast of moon, galaxies, nebulae and globular star clusters.

Main Use

It is a versatile filter that can be used for visual observations as well as astrophotography of planetary nebulae.

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.

Moon & Skyglow Spectrum and Characteristic

Substrate: B270
Thickness: 1.85mm
Tave:  T>90%
Blocking depth: light pollution line blocking >99%
Surface quality: 60/40
Transmitted Wavefront RMS: λ/4
 Parallelism: 30s

How to read the chart?

▲The horizontal axis is the Wavelength in Nanometers(nm).

▲The vertical axis is transmission in %.

3. Coating Technology

·Multi-layers anti-reflection coating

·Non-cementing optical substrate coating

·Optolong L-Pro filter adopts precision coating based on 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.

Packaging

Outer Box: silver box

Plastic Box: PP material

Lining: imported high pressure white EVA material

Notes

●About color: due to the influence of ambient light, color difference of the display and flash photography, the color of the product may have some color difference. Detailed color is in accordance with the final product.

●About coating: the interference filter will show different colors under different light, which is a normal phenomenon. Please refer to the material specification.

●About the description: the series of this product have the same material, technology and design, different sizes only, please note.