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YOU ARE HERE >> HOME | FILTERS | OPTOLONG L-Pro Imaging Filter

OPTOLONG : L-Pro Filter [ Deep-Sky Nebula Filter ]
Optolong L-eNhance Filter
L-Pro 1.25" Filter
 
 
 


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NAME SIZE INR
Optolong L-Pro Imaging Filter 1.25" - SOLD OUT 9300
Optolong L-Pro Imaging Filter 2" - SOLD OUT 12540
Optolong L-Pro Imaging Filter 77mm DSLR 20820
 
Optolong 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.
 
L-Pro Introduction
Optolong L-Pro (L-Professional) filter is designed to improve 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). Together with the 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.

Optolong 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.
 
Main Use and Performance
Suitable for visual observation and astrophotography.

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.

L-Pro filter alone can suppress infrared wavelength, and thus can be used at ease for “L” image shootings with CCDs.

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.
 
Technical Data
  • Optical glass fine material
  • Spectrum: 380-750nm
  • 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
  • High transmission at major nebula emission lines (i.e. H-alpha 656nm, OIII 496nm&500nm, SII 672nm and H-beta 486nm).
  • Precision off-band blocking, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm).
 
Specifications

Optolong L-Pro features:
★1.25"(1 1/4" mounted), 2" mounted for eyepiece
★Round 77mm, 82mm mounted to screw on the objective lens
★SLR Camera clip filters: EOS-C, EOS-FF, NK-FF, Sony-FF

 
Coating Technology
  • Multi-layers anti-reflection coating
  • Non-cementing optical substrate coating
  • Optolong 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.
 
CLS Spectrum and Characteristic
 
How to read the chart?
The horizontal axis is the Wavelength in Nanometers(nm).
The vertical axis is transmission in %.
The WHITE line shows the transmission of the filter. THe artificial lines are shown in YELLOW. H-Beta line is shown in BLUE, OIII line  is shown in GREEN, and H-Alpha line is shown in RED.
 
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.
 
PACKING

Outer Box: silve box
Plastic Box: PP material
Lining: imported high pressure white EVA material

 
 
 
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