【IMPROVED】SHO6.5nm Narrowband Filters
SHO filter kit stands for SII, H-Alpha, OIII narrow-band filters, generally working with astronomical monochrome cooling CCD and modified DSLR imaging in each single-channel . Corresponding with RGB channel (Ha, OIII, SII), photographers can process Hubble images by astronomical post processing software .
  • Description

  • Specification

1. Optolong SHO6.5nm NB Filters Introduction

Over the past year or more Optolong has put significant effort into solving the problem what always annoyed astronomers. Our goal was to reduce halos caused by our filters to a level were it would not noticeably affect imaging. By making a number of modifications in the coating technique, we finally made it.

Improved NB filters will give you higher contrast and greater detailed viewing, decrease background noise;

Through the optimization of the substrate and the upgrading of coating technology, significantly improved the halo around the stars, especially in O3.

Afriad of halos, use Optolong new version of SHO6.5nm filters.

⭐Allowing only a very narrow range transmitted by specific bandwidth design

⭐Increasing the contrast between the target and the night sky

⭐Blocking the moon emission, artificial light and infrared


2. Referance Spectrum


How to read the chart?

▲The horizontal axis is the Wavelength in Nanometers(nm).

▲The vertical axis is transmission in %.

▲The GREEN line shows the transmission of the OIII6.5nm filter. The H-Alpha7nm line is shown in  RED. And the SII6.5nm line is shown in BLUE.


3. Improved Version of SHO6.5nm Narrowband Filters Feature


Optolong SHO6.5nm kit(3pcs) Specifications Applicable Model Unit Price in US$
1.25" /1 1/4" mounted) M28.5*0.5 $465
2" mounted M48*0.6 $720
31mm unmounted CCD filter wheel $540
36mm unmounted CCD filter wheel $557


4. Manufacturing Technology

⭐High-precision grinding and polishing to make sure the substrate parallelism is greater than 30" and the surface accuracy is better than λ/4 ;

⭐Purified water ultrosonic clearning is aim to effectively remove impurities and dust from the substrate surface.

⭐Electron-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; IAD not only consolidates membrane compactness, increases film firmness, but also changes vacuum coating material characteristics.

⭐Planetary rotation system offers precision and homegeneity of coating ensuring high value on transmission of pass-band and Optical density of off-band;

⭐Non-cementing optical substrate coating;

⭐Quality Control: each filters is examined by Spectrophotometer for spectrum characteristic, and Laser Interferometer for surface accuracy.





5. Package 


2019 NEW package

※Note:We are now in the transition from the old to the new packaging style, ship is random.




6. Improved Version of SHO6.5nm Narrowband Filters Performance

I. IC1805, from Francesco Battistella: "This is the first image taken from my new observatory! I used the Optolong's narrowband filters and the results were excellent. I am very happy with Optolong's new NB filters."  Love it.
This photo is of the Heart Nebula in Hubble Palette technique - IC1805 - or rather a part of it, is a diffuse nebula in association with an open cluster and is found in the Constellation of Cassiopeia.
I used the Optolong's narrowband filters and the results were excellent. I am very happy with Optolong’s new narrowband filters.


Technical Information:
Telescope: AIRY APO 130T
Mount: NEQ6-Pro
Camera : QHY9 
Filter: Optolong improved HSO6.5nm
Frames: H-a: 40x900s -- OIII: 46x900s -- SII:46x900s
Total Integration: 33 Hours
Software: SGP – PHD2 – DSS -PixInsight – CS6
Location: Noventa di Piave (Venice) 4 meter above sea level – ITALY
Environment Temperature: About 23°C
Relative Humidity: 85%
Date: 31.07.19 - 16.08.19 - 17.08.19 - 18.08.19 - 25.08.19



II. NGC7635 was shot by Andrea Andreotto Maggi who used Optolong improved SII6.5nm, Halpha7nm and OIII6.5nm filters.              

Andrea's eye seemed tosignificantly improve the halo around the stars,especially in O3.--a comment from leave words.

Camera ZWO Astronomy Cameras 1600 mono
Telescope 107 Sharpstar with Riccardi reducer
Filter Optolong Astronomy Filter Narrowband

120 light 600 sec

Mount Sky-Watcher Eq8

Software APT - Astro Photography Tool Pixinsight Photoshop



III. Fireworks in Monoceros, shot by Terry Hancock, "I'm really loving the new Optolong narrowband filters, they did a great job on this.".

Technical Details
Captured and processed by: Terry Hancock
Location: GrandMesaObservatory.com Purdy Mesa, Colorado
November 1, 2, 3, 4th 2019
HA 430 min 43 x 600 sec
OIII 340 min 34 x 600 sec
SII 300 min 30 x 600 sec
Narrowband Filters by Optolong
Camera: QHY16200A
Gain 0, Offset 130 Calibrated with Dark and Bias Frames no Flat.
Optics: William Optics Redcat 51 APO @ F4.9
EQ Mount: Paramount ME
Image Acquisition software Maxim DL6
Pre Processing in Pixinsight
Post Processed in Photoshop CC
Starnet (star removal)

The Rosette Nebula (also known as Caldwell 49)This active star forming nebula lies in the Monoceros Constellation (the Unicorn) only 5,200 light-years distant. The dense cloud of hydrogen has been condensing to form new stars and is thought to be very similar to the environment that gave birth to our own Solar System. As the new stars ignite they blow off their shrouds and irradiate thier surroundings and cause the hydrogen to glow from the ionizing radiation. Like dust being blown by the wind, these newborns push the hydrogen and dust away where it collapses under gravity to accelerate the formation of yet more stars, excavating the inner region of the nebula over time.

The dark tendrils seen in the image are hiding the birthing cocoons of new stars which will eventually shed their egg-like shells, called globules, once they begin to fuse hydrogen into helium. As the brthing continues, the pressure from stellar winds will continue to increase until the available hydrogen has been collapsed into stars (where it has become dense enough) or simply blown away into the intersellar medium.



IV. North America Nebula in Narrowband © Chuck's Astrophot

This is NGC 7000 captured and processed in the Hubble Palette.

Technical card

Imaging telescope or lens:Orion ED80T CF apochromatic refractor

Imaging camera:ZWO ASI1600MM-PRO

Mount:Celestron CGX

Guiding telescope or lens:ZWO 60/280 Guiderscope

Guiding camera:ZWO ASI224MC

Focal reducer:Orion 0.8 Reducer

Software:Sequence Generator Pro, Photoshop CS3,  PixInsight,  PHD2

Filters:Optolong Ha 1.25" 7nm,  Optolong SII 6.5nm 1.25",  Optolong OIII 1.25" 6.5nm

Accessories:ZWO 8x 1.25" Filter Wheel (EFW),  MoonLite 2.5" Focuser with MotorFocus,  QHYCCD PoleMaster

Resolution: 2216x2723

Astrometry.net job: 2928163

RA center: 314.881 degrees

DEC center: 44.254 degrees

Pixel scale: 2.899 arcsec/pixel

Orientation: 22.742 degrees

Field radius: 1.414 degrees

Data source: Backyard



V. NGC2174-Monkey Head Nebula, shot by Francesco Battistella-AstroAtlas

Technical Information:
Telescope: AIRY APO 130T
Mount: Paramount MyT - Software Bisque
Camera : QHY9 
Filter: Optolong H-a 7nm, OIII 6.5nm, SII 6.5nm
Frames: H-a: 32x900s -- OIII: 32x900s -- SII:32x900s
Total Integration: 24 Hours
Software: SGP – TheSkyX – PHD2 – DSS -PixInsight – CS6
Location: Noventa di Piave (Venice) 4 meter above sea level – ITALY

Environment Temperature: About 2°C
Relative Humidity: 88%
Date: 29.12.19 - 30.12.19 - 31.12.19 - 01.01.20



VI. Improved center of M42, shot by Andrea Andreotto Maggi Astrophoto

Work in Progress....
Improved center of M42
Orion Costellation
Sharpstar Optics 76EDPH Artesky
Qhyccd 600 Mono
Filter Optolong Astronomy Filter Narrowband improved version
22 light 600 sec HA
15 Light 300 sec Red
15 Light 300 sec Green
15 Light 300 sec Blu
20 light RED 60 sec
20 light GREEN 60 sec
20 light BLU 60 sec
Software APT - Astro Photography Tool Tool Tool Tool Pixinsight Photoshop



Warm prompt

●About color: due to the influence of ambient light, color difference of the display and flash photography, the color of the product may have some color difference. Detailed color is in accordana with the final product.

●About coating: the interference filter will show different colors under different light, which is a normal phenomenon. Please refer to the material object.

●About the style: in order to improve the product, the change of design/appearance/parameters has not been updated in time. Please see the subject produce.

●About the description: the series of this product have the same material, technology and design, different sizes only, please note.

Optolong SHO6.5nm features 4 sizes:

★1.25"(1 1/4" mounted), 2" mounted for eyepiece

★Round 31mm unmounted, 36mm unmounted for filter wheel