Moon&Skyglow Filter 2”

Description

Moon&Skyglow Filter 2”
Moon&Skyglow Filter 2”
Moon&Skyglow Filter
Moon & Skyglow filter is designed to darken the background sky by blocking light transmission from skyglow 589nm and many street light emissions from artificial light. Its high efficiency preserves image brightness, reveals more details and increases contrast of moon, galaxies, nebulae and globular star clusters.
Main Use and Performance
Ideally it is quite versatile filter for visual observation and astrophotography on planetary 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.
Technical Data
Schott substrate material
Thickness 2.0mm
Surface Quality: 60/40 (Refer to MIL-O-13830)
Fine-optically polished to ensure accurate 1/4 wavefront and <30 seconds parallelism over the both surfaces
Infrared wavelength 700-1100nm cut-off
Coating Parameter
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
Filter Cell
Ultra-thin filter cell minimize vignetting by maximize possible clear aperture (clear aperture is for 2”)
Aerometal Material | Precise CNC Machining | Sand Blasting Process | Black Anodized Finish | Extinction Treatment to Prevent Reflection | Laser Engraving No Fading
Package
Plastic PP Case | Imported High Pressure EVA Case Lining | Silver Cardboard Box | High Density Sponge Carton Lining
Size
Standard 2”
Spectral Curve
Shipping
Shipping cost:
We ship via United States Postal Service (USPS). The shipping calculations occur upon checkout.
Delivery time:
Most products ship within 2 business days.
Payment
We accept the following payment methods:
Paypal
We accept any major credit card, including American Express, Visa, MasterCard, and Discover, debit cards tied to a checking account, and prepaid cards
Please contact us if you have any questions.
Service
All of our products are new product and are shipped in good condition in packaging intended for them to arrive in good condition.  You can return any of our products within 90 days for any reasons and receive a full refund if the instructions have been followed. Included with the filter are instructions for use and care.