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Condition:
This is a used Optolong L-Pro filter for a 77mm camera. It is in excellent condition with clean optics. This does include its original jewel case, but does not have the original box.
Description:
The L-Pro (L-Professional) filter is the best light pollution filter with multi-bandpass filter which offers better color balance by maximizing the transmission band by selectively reducing the transmission of wavelengths of light pollutants. Specifically, those produced by artificial lighting, including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).
The L-Pro filter enhances highly transparent main nebula emission lines at OIII (496nm and 500nm), H-beta (486nm), NII (654nm and 658nm). It enhances the contrast and details for both visual and photographic purposes in areas with heavy light pollution.
Specifications:
Technical Data
- Tpeak: T>90%
- Spectrum: 380-750nm
- Optical Density: Light pollution emission is blocked 90%
- Surface Quality: 60/40
- Transmitted Wavefront RMS: 1/4
- Parallelism (arcsec): 30s
- Schott substrate material
- Thickness 2.0mm
- Surface Quality: 60/40 (Refer to MIL-O-13830)
- Optically polished to ensure accurate 1/4 wavefront and <30 seconds parallelism over the both surfaces
Coating Parameter
- Non-cemented 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 minimizes vignetting by maximizing possible clear aperture (clear aperture is 26mm for 1.25”; 45mm 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