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Telescope UHC Filter Lens High Contrast Observation Astronomy Monocular 1.25
Telescope UHC Filter Lens High Contrast Observation Astronomy Monocular 1.25
Telescope UHC Filter Lens High Contrast Observation Astronomy Monocular 1.25
Telescope UHC Filter Lens High Contrast Observation Astronomy Monocular 1.25
Telescope UHC Filter Lens High Contrast Observation Astronomy Monocular 1.25

Telescope UHC Filter Lens High Contrast Observation Astronomy Monocular 1.25" 2"

$ 45.13

Availability: 100 in stock

Description

Telescope UHC Filter Lens High Contrast Observation Astronomy Monocular 1.25" 2"
Technical Data
Schott substrate material
Thickness 2.0 mm (1.25”/2”/36mm/77mm/82mm)
Thickness 1.0 mm (Clip series)
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
95% transmission of main nebula emission lines (i.e. H-alpha 656nm, OIII 496nm and 500nm, SII 672nm and H-beta 486nm
0.1% transmission of off-band, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm). Transmission of 0.1% is equivalent to OD3(Optical Density), and a high optical density value indicates very low transmission, and low optical density indicates high transmission.
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
Main Use and Performance
Suitable for color CCD cameras and unmodified DSLRs
UHC with narrower passband provides higher contrast than CLS. Thus it is more suitable for urban environment where you suffer from severe light pollution.
UHC has a substantial red passband and offer superb views for objects like the Orion Nebula (M42)
Light pollution 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.
Spectral Curve
The Major Emission Lines of Nebulae
H-β486.1nm OIII 495.9nm OIII 500.7nm H-α656.3nm
The Major Emission Lines of Artificial Light Pollution
Hg 435.8nm 546.1nm 577nm 578.1nm
Na 598nm 589.6nm 615.4nm 616.1nm