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Optolong Optics Co., Ltd is the brand owner of Optolong is a manufacturer of fluorescence filters, astronomy filters.
We also offer other Interference filters (Common interference filters are divided into two categories – Edge filters : Longpass filters , Shortpass filters , Dichroic mirrors , Reflective mirrors , Anti-Reflective mirrors , Beamsplitters , Notch rejection filters , Polarizers , Neutral density filters and Bandpass filters :Narrow bandpass filters , Ultra narrow bandpass filters ) like uv filters, visible filters,infrared filters and near infrared filters and other optical mirrors as an OEM service.

Located in Kunming city in China which is one of the four optics centers and the coating experience of 22 years (since 1999) enables us to design and produce the filters with the most sophisticated spectrum.

We are glad to declare that Optolong has become the first and only non-replaceable brand for astronomical filters in China. Optolong brand is also known as the comparable filters with an international brand by distributor clients around the world.


Five Bands Bandpass filters L-Pro has gotten the most positive feedback from astronomy photographers, astronomy amateurs. We also manufacture other filters like UHC, H-Beta, O-III, H-Alpha, SII, LRGB, Night Sky H-Alpha are also. Check more info on the astronomy filters page.

Fluorescence filters:
Single band filters: DAPI, FITC, TRITC, TexasRed, GFP, CFP, Cy5 ;
Fish series filters: Fish-Aqua, Fish-Green, Fish-Orange, Fish-Red ;
Longpass series filters: LP-DAPI, LP-FITC, LP-TexasRed ;
Multibandpass filters (Dual band filters) : Green-Orange, FITC-TexasRed ;
Multibandpass filters (Triple band filters) : DAPI-Green-Orange, DAPI-FITC-TexasRed.

All the other direction of Optolong Filters we produce are with the dark background and bight signal which is becoming the essential tool for fluorescence instrument manufacturers, universities, and study institutions.We are the first manufacturer who launches fluorescence filters set for FISH products which require more accurate control on the spectrum and overlap in China. Check more product info on the fluorescence FISH filter set.

Optolong is also specialized in manufacturing high volume optical filters for applications like machine vision, analytical instruments, life science, industry detection, and lasers. With the hard thin film coating machine, experienced filters design technician, experienced coater operator, stable control, durable property, a lot to lot consistency, Optolong has become the supplier choice of many international instrument manufacturers.

From prototype to high volume production, Offering thousands of most complex spectrum complex for clients all over the world, Optolong has been insisting on the Company philosophy that not big as an elephant, but small and flexible like a hummingbird. We always pursue supreme quality and client satisfaction.

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