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ZWO 2-Inch Narrowband Filter Set - 7nm


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  • Reduces the transmission of certain wavelengths of light
  • Fine-optically polished to ensure accurate 1/4 wavefront over both surfaces
  • About 90% transmission at H-alpha line 656nm (H-Alpha filter)
  • About 90% transmission at SII line 672nm (SII filter)
  • About 90% transmission at major OIII line 500nm (OIII filter)

Product Details

  • Narrowband filter does not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.

    It can reduce 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).

    Technical Parameter:

    • Name: ZWO New narrowband 2″ filter
    • Size: 2″
    • Thickness: 5mm+2.5mm(thread)
    • Glass thickness: 1.85mm
    • Thread: M48*0.75 male thread

    The ZWO H-Alpha filter has a bandpass of 7nm and passes light at 656nm wavelength, light transmission rate comes up to 80%. Best choice of narrowband H-alpha astrophotography filter for high-contrast imaging and revealing rich details of the nebula even in areas with strong light pollution, just prepare to experience the infinite fun with it!

    The ZWO narrowband S-II 7nm filter passes light at 672nm wavelength with a bandpass of 7nm which is designed for nebula observation. It is suitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants, use it with H-alpha and OIII narrowband filters (SHO Set) for tricolor CCD astrophotography.

    The ZWO narrowband O-III 7nm filter is designed for nebula observation allowing the 7nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission lines, blocking out all other light. Adding the ZWO O-III Narrowband filter to your imaging collection will help you go beyond the RGB imaging and will help capture your favorite nebulas in a totally new light, no matter how polluted your skies may be!

    Technical Data

    • FWHM:7±0.5nm
    • Fine-optically polished to ensure accurate 1/4 wavefront over both surfaces
    • About 90% transmission at H-alpha line 656nm (H-Alpha filter)
    • About 90% transmission at SII line 672nm (SII filter)
    • About 90% transmission at major OIII line 500nm (OIII filter)
    • Infrared wavelength 700-1100nm cut-off
    • <0.1% transmission of off-band, OD3 (Optical Density)
  • specifications

    Filter TypeKit
    Free ShippingYes
  • included items

    • ZWO 2-inch H-Alpha 7nm filter
    • ZWO 2-inch narrowband S-II 7nm filter
    • ZWO 2-inch narrowband O-III 7nm filter

Product Reviews

Customer Reviews
4.7 Based on 9 Reviews
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Ron D.
United States United States

CMOS finally comparable/better than CCD technology for Astronomy

A game changer, both in price and performance. It has proven that CMOS technology can surpass CCD technology. My first use of CMOS for Science and not disappointed. Does require deeper study so one can most effectively understand proper setup of Offset and Gain depending on your target. More documentation on setup of Offset and Gain would be good for new owners, however. Imagine an image with the field of view of a 16803 (CCD chip) camera, at less than half the price; as well as quieter signal! I’ve now used both for Science! Ron Diiulio, Director (ret.) Astronomy Program University of North Texas

United States United States

My First Dedicated Astrophotography Camera, What a Delight!

I started astrophotography as a hobby in January 2021 with a DSLR. I had no background in photography and didn't even own a telescope until this winter. I planned to start with just a DSLR that I bought in January, but I quickly got addicted. I received my ZWO ASI6200MM and kit with the 7 position filter wheel and ZWO LRGB and Ha, SII, OIII filters a couple weeks ago. I had never used a dedicated astrophotography camera prior, let alone a monochrome camera with a filter wheel. When I received the camera, filter wheel, and filters I loaded the filters into the wheel and sorted through the spacers that came with the camera and wheel. I was able to get the backfocus I needed using the pieces that came with the EFW and camera. I had to do some cable management, and I did need to buy a large losmandy style dovetail (thanks OPT!) to get it balanced. I already had the ASCOM platform and drivers for ZWO cameras for my guide camera, so everything was essentially plug and play right out of the box and connected with no additional software to my current capture software. This camera is amazing. I live 5 feet above sea level, have poor transparency, high winds, high humidity, and Bortle 6 skies with Bortle 7 light domes a couple miles almost all around me. My scope is f/4.7 with its reducer, but it is only 382mm. I never would have thought I would be able to get images like I am now on smaller targets especially from my backyard, but the sensor in this camera picks up amazing details even in poor conditions and the resolution is huge. I would also like to thank OPT and Ron specifically for working with me to split out the camera, EFW, and filter wheel from the kit so that I could begin using the camera. I had asked about splitting the order on the online chat and closed my browser right away without waiting for a response. The next day I had an email stating the order would be split, and a few days later I had everything on my scope. The Hubble shot of the Pillars of Creation is one of the first images of space I remember ever seeing and is to this day one of if not my favorite image. Four months into the hobby, only 2.9 hours of integration (6x300s Ha, 17x600s OIII, and 12x300s SII) with poor seeing, and I was able to take my own picture of M16 and the Pillars of Creation. I still have plenty of learning on how to process images, but it's a journey I am excited to take. Space is amazing.

OPT Telescopes ZWO ASI6200MM Pro Cooled Monochrome Camera Deluxe Package - ZWO-ASI6200MMP-K3 ReviewOPT Telescopes ZWO ASI6200MM Pro Cooled Monochrome Camera Deluxe Package - ZWO-ASI6200MMP-K3 Review
Switzerland Switzerland

Heavy and bulky

Make sure your telescope is long and heavy enough to balance this filter wheel.

David I.
United States United States

An absolutely awesome camera

The quality of this camea is very good. Like other ZWO products, its solidly built and has a huge sensor with 62 Mega Pixels. I tried it out on a couple of scopes and the camea performed fine, with 2" adapters, you get the full frame view. This is one of the top-of-the-line cameras from ZWO, and is sure to provide excellent performance, ideal for use in astrophotography or astronomical research.

Kevin H.
United States United States


The ASI6200mm is a joy to use. Setting it up was easy using published documentation for the camera and the filter wheel that I purchased at the same time. I used only a OSC SLR before so I had to learn new post techniques.

OPT Telescopes ZWO ASI6200MM Pro Cooled Monochrome Camera Deluxe Package - ZWO-ASI6200MMP-K3 Review
Yan W.
United States United States

Flexible and easy to install

Pretty easy to install. I used it with a filter drawer on a harmonica drive mount. It reduced the guiding error down to 1/3 of a guidescope. With it I was able to guide consistently under 1" error using a RST-135, and achieve round stars for 5 min exposure. Recommended for harmonica drive mounts.