Part of the Optolong SHO-3nm filter kit, which includes SII 3nm, H-Alpha 3nm, and OIII 3nm narrowband 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.

H-Alpha 3nm filter is the popular narrowband filter allowing 3nm bandwidth of light centered on a wavelength of 656nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure vapor lights and unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Better choice of narrowband H-Alpha astrophotographer filter for highest contrast and revealing subtle nebula details.

Narrowband OIII-CCD 3nm filter is designed for nebula observation allowing 3nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission line, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e.skyglow).

OIII emits 495.9nm and 500.7nm and it is a blue-green colored filter. Many of images of planetary nebula and supernova remnants are taken only with H-Alpha and OIII filters. They show great structural details, but have natural colors, looking like an RGB image.

Narrowband SII CCD 3nm filter (Sulfur II for CCD) is designed for nebula observation allowing 3nm bandwidth of light centered on a wavelength of 672nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).

Features:

• Give you higher contrast and greater detailed viewing
• Decrease background noise and improve the contrast of objects
• Increase the faint nebula signal and make it brighter
• With the narrowband filters kit, you are able to process a Hubble image through the optimization of the substrate and upgrading of coating technology.

Reference Spectrum

※This curve is only for reference, and is not used as the final product data.

How to read the chart?

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

▲The vertical axis is transmission in %.

▲The BLUE line shows the transmission of OIII3nm.The H-Alpha 3nm line is showen in GREEN. And the SII 3nm filter line is shown in RED. 

Optolong SHO-3nm Narrowband Filters Performance 

As we all know, OIII narrow band filter has always been a problem in the aspect of halo. Thanks to the experience of 7nm narrow band filter, the halo of OIII 3nm filter was optimized by optimizing the coating technology. This time, we also conducted a qualitative halo test in the bright star of veil Nebula, and it can be seen from the original picture that OIII 3nm performs better in the bright star.

Telescope：RASA 11" f2

Camera：QHY 600

Mount: IOptron CEM120

Optolong OIII-3nm single 10min

Copyright: Wuzhen

I. The Bubble Nebula (NGC 7635)  © Astrodoc Ron Brecher  

Acquisition, focusing, and control of Paramount MX mount with N.I.N.A., TheSkyX and PHD2. Focus with Optec DirectSync motor and controller. Equipment control with PrimaLuce Labs Eagle 4 Pro computer. All pre-processing and processing in PixInsight. Acquired from Ron‘s SkyShed in Guelph. Average transparency and seeing. Data acquired Oct 18-19, 2021 under a brightly moonlit sky (Moon 12 days old)..

Sky-Watcher Esprit 150 f/7 refractor and QHY600M camera with Optolong H-alpha, O(III) and S(II) 3nm filters – FIRST LIGHT WITH 3nm BANDPASS FILTERS

Ha: 9 x 20m = 3hr00m
O3: 10 x 20m = 3hr20m
S2: 9 x 20m = 3hr00m

Total: 9hr20m

Image scale 0.72 arcsec per pixel 

Ⅱ. Pacman Nebula NGC 281 in the Hubble Palette  © Luca Fornaciari Astrophotography   

Pacman Nebula NGC 281 in the Hubble Palette
With the bad weather persisting I have taken these last few weeks to experiment with new way in the development of narrowband shots.
I'm happy because I'm defining a Hubble Palette that really feels mine, designing it a little at a time.
Narrowband is creative and fun because it allows us a good deal of freedom to experiment with the integration of the individual channels and the image you see is a developing version of what I am building.
The image was obtained with the new 3nm Optolong filters. If the bad weather will allow me a few nights I will soon finish my tests on these filters, but for now the impressions are really good.
240 minutes of Ha, 510 of OIII and 260 minutes of SII with the ASI 294MM and the Sky-Watcher 300 f/4.
I wish you a beautiful sunny day!
SETUP:
Sky-Watcher 300 f / 4 on EQ8R-Pro
ZWO ASI 294MM, Optolong Filters Ha 3nm, OIII 3nm, SII 3nm

III. NGC7000  © Tommaso Massimo Stella   

Finalmente, dopo mesi, sono riuscito a testare parte dei nuovi filtri Optolong Astronomy Filter ha 3nm ancora non sul mercato (sono un beta tester).

Ⅳ. Nebulose Nord America  © Tommaso Massimo Stella   

Test dei nuovi filtri Optolong Astronomy Filter H alpha e OIII a 3nm (non ancora sul mercato) sotto cieli inquinati (Bortle 8/9), con camera a colori e diametro limitato.
Elaborazione basica, senza considerare il colore delle stelle.
Purtroppo il meteo mi ha concesso circa 3 ore per canale, manca ancora l'SII per comporre l'Hubble palette, spero di poter terminare la prossima settimana.
Lights: 12x900s (Ha 3nm) + 20x600s (OIII 3nm)
Telescope: Takahashi FS-60CB + Reducer 0,72x
Camera: QHY 168C
Mount: Skywatcher AZ-EQ6 GT
Processing: DeepSkyStacker, PixInsight, Photoshop CC   

V. North America & Pelican Nubulae (Hubble Palette)  © Tommaso Massimo Stella   

Shooting took place on 1,4,27 and 28 October 2021 in Taranto (Italy) at about 20m above sea level.
Lights: 16x900s Ha + 21x600s OIII + 9x900s OIII + 16x900s SII
Sky: Bortle 9
Total exposure: 13,75 h
Telescope: Takahashi FS-60CB + Reducer 0,72x
Camera: QHY 168C
Filters: Optolong Astronomy Filter Ha, OIII, SII 3nm
Mount: Skywatcher AZ-EQ6 GT
Processing: DeepSkyStacker, PixInsight, Photoshop CC

Ⅵ. The Lobster Claw Nebula  © Astrodoc Ron Brecher   

Acquisition, focusing, and control of Paramount MX mount with N.I.N.A., TheSkyX and PHD2. Focus with Optec DirectSync motor and controller. Equipment control with PrimaLuce Labs Eagle 4 Pro computer. All pre-processing and processing in PixInsight. Acquired from my SkyShed in Guelph. Average transparency and seeing. Acquired October 28-November 8, 2021 under a partly moonlit sky.

Sky-Watcher Esprit 150 f/7 refractor and QHY600M camera with Optolong H-alpha, O(III) and S(II) 3nm filters

Chrominance: Takahashi FSQ-106 ED IV @ f/5 and QHY367C Pro one-shot colour camera with Optolong UV/IR filter. 

Ha: 22 x 20m = 7hr20m
O3: 22 x 20m = 7hr20m
S2: 22 x 20m = 7hr20m189 x 5m

OSC = 15hr45m

Total: 22hr for narrowband image; 37hr45m for broadband/narrowband blend

Image scale 0.72 arcsec per pixel  

Processing workflow is for the Hubble Palette image. 

The broadband image was processed similar to IC 5068, with the luminance of the narrowband image used instead of Ha alone.

Data Reduction and Cleanup
The WeightedBatchPreProcessing script was used to perform calibration, cosmetic correction, weighting, registration and integration of all frames. 

Ⅶ. NGC6960 © Andrea Andreotto Maggi Astrophoto   

Telescopio Artec 200
Camera Zwo Asi 294 MM
Filtri Optolong Astronomy Filter RGB HA 3nm OIII 3nm
60 Light RED 300 sec
60 Light GREEN 300 sec
60 Light BLUE 300 sec
36 light HA 600 sec
36 light OIII 600 sec
Montatura 10 Micron 1000 hps
Software Voyager Astrophotography Automation

Ⅷ. Rosette nebula © Andrea Andreotto Maggi Astrophoto   

Prove di post su vecchie riprese
Telescopi o obiettivi di acquisizione: Sharpstar 76EDPH · 
Camere zwo asi 071 MC zwo Asi 1600 MM zwo asi 2600 MC 
Montature: SkyWatcher EQ6 PRO GOTO 
Filtri: Optolong 2" Ha O3 S2 · Optolong L-Pro 2" · Optolong L-eNhance
58 light 300 sec L-PRO
70 light 600 sec L-eNhance
20 light 600 sec HA
20 Light 600 sec OIII
20 Light 600 sec SII 

Ⅸ. Ha3nm test © YaGe   

Lens: SharpStar ACL200

Camera: ZWO ASI 6200 MM Pro

Mount: iOptron CEM60

Guide: SharpStar ACL200

Star guide camera: ZWO ASI290MM mini

Software: Pleiades Astrophoto PixInisight ·Astro Pixel Processor 

Filter: Optolong Ha 3nm

Copyright：鸭哥

About Optolong

While Optolong is a relative newcomer to the astronomy industry, they are no strangers to optics and filters. Optolong is a division of Yulong Optics Company, a high tech company specializing in optical filter design and production. Their products include bandpass filters, flourescence filters, edge filters, longpass and shortpass filters, beam splitters, anti-reflection coatings, optical mirrors and, of course, astronomical filters.

Established in 1999 and based in Kunming City, China, Optolong/Yulong provides nearly 2000 types of optical filter coatings annually to customers worldwide in a wide variety of industries and applications.