L-Pro Filter

L-Pro Filter

Supplier
Optolong
Category
Optical Filters
Origin
China

Flagship product. This versatile astronomical filter uses multiple passbands over visible 400-700nm to preserve color reproduction and image detail in deep-sky objects and Milky Way star fields. Other light-pollution filters cut much of this detail. Under light pollution it suits emission nebulae, emission nebulae, and continuous-spectrum targets. For visual use it maintains ample throughput while reflecting pollution wavelengths, improving contrast to distinguish targets. Source image/chart headings and captions: product images; specifications; reference spectrum. How to read the spectrum: horizontal axis is wavelength in nm; vertical axis is transmission in %; red is the product curve, green nebular emission lines, orange artificial mercury/sodium lighting. Comparison images: M42 Orion Nebula; summer Milky Way. Gallery: M42 Orion Nebula, Nikon 810A+Paramount MX+Williams Optics FLT132+L-Pro Filter ©Jerry Huang. “Summer Milky Way—Cameron Tea Plantation,” modified Nikon D750+Sigma 20mm f/1.4+Optolong L-Pro filter @Sammax Chong. M20 Trifid Nebula, QHY247C+Celestron RASA astrograph+iOptron CEM60+L-Pro Filter ©Wu Zhen. Death Valley, USA, Nikon D810A+Samyang 24mm f/1.4+L-Pro Filter ©Yuri Beletsky. Source packaging and notes: packaging. Color: ambient light, monitor differences, and flash photography may cause color differences; refer to the actual item. Coating: interference filters normally show different colors under different light; refer to the actual item. Design: improvements to design, appearance, or parameters may precede updated information; refer to the actual item. Description: materials, workmanship, and process design are the same throughout this series; only sizes differ.

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Overview

Flagship product. This versatile astronomical filter uses multiple passbands over visible 400-700nm to preserve color reproduction and image detail in deep-sky objects and Milky Way star fields. Other light-pollution filters cut much of this detail. Under light pollution it suits emission nebulae, emission nebulae, and continuous-spectrum targets. For visual use it maintains ample throughput while reflecting pollution wavelengths, improving contrast to distinguish targets. Source image/chart headings and captions: product images; specifications; reference spectrum. How to read the spectrum: horizontal axis is wavelength in nm; vertical axis is transmission in %; red is the product curve, green nebular emission lines, orange artificial mercury/sodium lighting. Comparison images: M42 Orion Nebula; summer Milky Way. Gallery: M42 Orion Nebula, Nikon 810A+Paramount MX+Williams Optics FLT132+L-Pro Filter ©Jerry Huang. “Summer Milky Way—Cameron Tea Plantation,” modified Nikon D750+Sigma 20mm f/1.4+Optolong L-Pro filter @Sammax Chong. M20 Trifid Nebula, QHY247C+Celestron RASA astrograph+iOptron CEM60+L-Pro Filter ©Wu Zhen. Death Valley, USA, Nikon D810A+Samyang 24mm f/1.4+L-Pro Filter ©Yuri Beletsky. Source packaging and notes: packaging. Color: ambient light, monitor differences, and flash photography may cause color differences; refer to the actual item. Coating: interference filters normally show different colors under different light; refer to the actual item. Design: improvements to design, appearance, or parameters may precede updated information; refer to the actual item. Description: materials, workmanship, and process design are the same throughout this series; only sizes differ.

Specifications

ParameterValue
Dimensional Specifications1.25''/2''
Dimensional SpecificationsEOS-FF/EOS-C/NK-FF/Sony-FF/77mm

Key Features

Precision polishing on both sides ensures substrate parallelism better than 30 arcseconds and surface figure better than λ/4. Ultrasonic cleaning with purified water uses a 13-tank process to remove surface impurities and dust. Ion-assisted coating improves film density, adhesion and uniformity while reducing thermal drift. Rigorous quality inspection includes photometer spectral testing and laser-interferometer surface-figure testing for every filter.

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Supplier Information

Op
Optolong
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Founded in 1999 and located in Kunming, Yunnan, Kunming Yulong Optoelectronic Technology Co., Ltd. specializes in optical filters. Products include astronomical filters, fluorescence filters, bandpass filters, UV filters, beam splitters, and more, widely used in machine vision, medical, life sciences, and industrial inspection. The Optolong brand is sold in over 30 countries. The company holds ISO9001 and RoHS certifications and aims to be a trusted partner in optical filters.

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L-Pro Filter
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