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Model: OLPRONFFBrand: Optolong
Generally In Stock, Please Confirm Before Ordering
The Optolong L-Pro (L-Professional) filter is designed to provide maximum luminosity of the spectrum other than those areas caused by light pollution...Designed for slightly light polluted, suburban and rural areas where there is light pollution, but not severe.
It improves the visibility of various deepsky objects by selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings 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). As this filter is highly transparent in main nebula emission lines at OIII (496nm and 500nm), H-beta (486nm), NII (654nm and 658nm), H-alpha (656nm) as well as SII (672nm), the filter is suitable for enhancing the contrast and details for both visual and photograghic purpose at sub-rural area with heavy light pollution.Unlike other light pollution filter UHC and CLS, L-Pro is multi-bandpass filter which offers better color balance by maximizing the transmission band. The balanced transmission allows astrophotos to be taken with minimal color cast to broadband emission objects such as galaxies, reflection nebulae and globular star clusters. L-Pro is the best choice for light pollution suppression.
By providing maximum luminosity it reduces exposure time that is an important factor in deep sky imaging.
Compatible with the following FULL FRAME Nikon cameras: D600 / D610 / D700 / D750 / D800 / D800E / D810 / D810A / DF
Main Use and PerformanceSuitable for visual observation and astrophotography. The optolong L-Pro filter has a very low transmission reduction rate against continuous spectrum space objects, and thus is quite effective in suppressing light pollution sources when shooting galaxies, reflection nebulae and globular star clusters. The same holds true for visual star observations. The L-Pro filter alone can suppress infrared wavelength, and thus can be used at ease for “L” (luminosity) image shootings with CCD cameras. Please note that light pollution filters do not completely eliminate the effects of light pollution and definitely do not increase the object’s brightness, however they increase the contrast between nebula and night sky by making the background darker.
Optolong filters are not designed for solar observation. DO NOT LOOK AT THE SUN WITH ANY OPTOLONG FILTER as permanent eye damage will be the result.
Technical DataSchott substrate materialGlass thickness 2.0 mm (1.25”/2”/77mm) and 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 both surfaces90% transmission of main nebula emission lines (i.e. Ha 656nm, OIII 496nm & 500nm, SII 672nm and H-beta 486nm).Precision transmission of off-band, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm).Filter CellUltra-thin filter cell minimise vignetting by maximising possible clear aperture (clear aperture is 26mm for 1.25” size and 45mm for 2” size)Aerometal MaterialPrecise CNC MachiningSand Blasting ProcessBlack Anodized FinishExtinction Treatment to Prevent ReflectionLaser Engraving No FadingAvailable SizesStandard 1.25” & 2”Round 77mm UnmountedEOS APS-CEOS Full FrameNikon Full Frame
CompatibilityThis filter is compatible with the following FULL FRAME Nikon cameras: D600 / D610 / D700 / D750 / D800 / D800E / D810 / D810A / DF
PackagingPlastic PP CaseImported High Pressure EVA Case LiningSilver Cardboard BoxHigh Density Sponge Carton LiningOptical CoatingMulti-layer anti-reflection coatingNon-cementing optical substrate coatingElectron-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. (Please note, "planetary rotation system" is a type of optical coating process and does not refer to the astronomical system describing the motion of the planets in our solar system.)
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Rother Valley Optics
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Rother Valley Optics Ltd is registered in England and Wales 04762707. Registered Office: 21 Station Road, Kiveton Park, Rotherham, S26 6QP. Rother Valley Optics Ltd acts as a credit broker only. Rother Valley Optics Ltd are authorised and regulated by the Financial Conducts Authority. Credit provided subject to age and status..
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