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Cyclops Optics

Optolong 6.5nm SHO Filters Set


Optolong 6.5nm SHO Filters Set

Shipping Weight:
0.15 KGS
Typically ships in 24 hours
Calculated at checkout

Product Description

Optolong 6.5nm SHO narrowband filters set is for astrophotographers who want to obtain the maximum contrast of nebulae while cutting out background emission and suppressing star lights. This filter set includes a 7nm hydrogen-alpha filter and 6.5nm sulphur-II & oxygen-III filters.These filters cover the major emission lines of emission type nebulae. These filters are also commonly used by astrophotographers to present their photos in Hubble Pallete.

Compared to LRGB imaging, SHO narrowband imaging works even under full moon or severely light polluted area. H-alpha exposures can also be combined with LRGB to achieve greater details in the nebulae structure. 



  • 80% transmission at O-III line 500.7nm, H-alpha line 656nm, S-II line 672nm
  • 6.5nm bandwidth for O-III and S-II
  • 7nm bandwidth for H-alpha
  • Multi-layers anti-reflection coating
  • Precise and sharp roll-off at off-band
  • Infrared cut-off at 700-1100 nm
  • 2 mm filter thickness
  • Made on Schott substrate
  • Finely polished to 1/4 wave accuracy
  • Surface quality: 60/40 (MIL-O-13830 standard)

Recommended applications

  • Monochrome CCD/CMOS camera
  • Deep sky narrowband imaging

Available in sizes

  • 1.25" (26mm clear aperture)
  • 36mm round unmounted
  • 2" (45mm clear aperture)

Coating technologies

  • Multi layers anti-reflection coating
  • Non cementing optical substrate coating
  • Electron-beam gun evaporation with ion-assisted deposition coating technology to enhance coating durability and resistance to scratching as well as stability on central wavelength such that passband does not deviate with temperature change
  • Planetary rotation system offers high precision and homogeneity of coating surface ensuring high value on passband transmission and off-band blocking. 

Filter cell technologies

  • CNC machined with aerospace grade aluminium
  • Black anoidised finish and extinction treatment to prevent refection
  • Laser engraved fade-free wordings 

We care about delivering your filter in perfect form and thus every Optolong filter sits on a high density sponge carton lining and packaged in highly rigid plastic PP case with high pressure EVA case lining. 

User gallery

IC1805 Heart Nebula (HOO)
Author: Morning
October 2015, China
Camera: QHY9M
Optics: Sharpstar CF90II + Intane 0.71x reducer
Filter: Optolong SHO
Exposure: Ha 4hr, SII 3hr, OIII 3hr (10 hours)

IC1805 Heart Nebula (HOO)
Author: tiantian99
August 2015, Beijing China
Camera: QHY9M
Optics: RC8+SX-AO
Filter: Optolong Ha 7nm, OIII 12nm
Exposure: Ha 2hr, OIII 4hr (6 hours)


M81 & M82
Author: tiantian99
January 2015, Beijing China
Camera: Nikon D7000 (mono mod)
Optics: RC8 with 0.67x reducer
Filter: Optolong LRGB + Ha 7nm
Exposure: L:Ha:RGB = 2hr:8hr:2hr each (16 hours)

About Optolong


Optolong is a brand dedicated for astronomical filters R&D and production under Kunming Yulong Optical & Electronics Technology Co. Ltd. Yulong is a professional manufacturer of high quality filters since 1999. Yulong has passed ISO9001 quality certifcation and all products meet ROHS standard authorised by SGS test. 

Their major equipment include ultra clean room, five precise vacuum coating machines, Shimadzu UV-VIS-NIR spectrophotometer, 12 sinks ultrasonic cleaning machines and grinding/rolling/cutting machines.

Optolong filters only use the best glass — German's Schott glass as the substrate which has an industry leading level of flatness which is crucial to minimise the occurence of halo and ensure high quality image.

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