ZWO | SKU: ZWO-NB7nm1.25

$49.00 off

ZWO 7nm Narrowband SHO Filters (Ha, OIII & SII)

Name: ZWO 7nm Narrowband SHO Filters (Ha, OIII & SII)
Rating: 5.00 (1 reviews)

$468⁰⁰ $517⁰⁰

Shipping calculated at checkout.

Filter

Filter Set (SHO) Oxygen III H-Alpha Sulfur II

Filter Size

1.25" Mounted 31mm Unmounted 36mm Unmounted 2" Mounted

Pickup available at ASTRONOMY PLUS

Usually ready in 2 hours

FREE SHIPPING FOR ORDERS OVER $500* 🆓🚚

*Some exceptions may apply. More info

We Have it in Stock? We're on it, shipping your order on the same day.

*Ordered before 2PM ET & Business Hours only / This is an estimation and may vary

What if the product is not in stock?

🛫 If the item is unavailable: It may be in transit to us or on order with the supplier. If not, we will promptly place the order. In case of delays, we will do our best to keep you informed. Don't hesitate to email us for delays.

🇨🇦 Canadian Authorized Dealer

Buy with confidence from a trusted Canadian astronomy retailer. We provide full pre-sale and after-sale support, expert advice, warranty assistance, and real technical help from passionate astronomers.

ZWO 7nm SHO Narrowband Filters (Ha, OIII & SII)

The ZWO SHO Narrowband Filter Set contains one H-alpha, one OIII and one SII filter. Use it for tricolor CCD astrophotography. Available in 1.25″ & 2″ round mounted sizes as well as 31mm & 36mm round unmounted sizes.

The ZWO H-alpha 7nm Narrowband Filter has a bandpass of 7nm and passes light at 656nm wavelength, light transmission rate comes up to 90%. 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 OIII 7nm Narrowband 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!

The ZWO SII 7nm Narrowband 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.

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).

New vs Old Filters

New Ha filter is based on the new base glass, less reflection( less halo of bright stars).

We made a test of our Ha Filters (ASI1600 mono camera, single frame, 300s, DDP in MaximDL) :

New OIII filter is based on the same base glass, new coating standard, better block rate of off-band.

New SII filter is based on the new base glass, less reflection( less halo of bright stars).

Technical Specifications

FWHM	7±0.5nm
Sizes	1.25″ Round Mounted 31mm Round Unmounted 36mm Round Unmounted 2″ Round Mounted
Glass Thickness	2.0+/-0.03 mm
Polishing	1/4 wavefront over the both surfaces
Transmission	About 90% at SII line 672nm <0.1% transmission of off-band, OD3(Optical Density)
IR-Cut	700-1100nm cut-off

In the Box

Filter
Case

Manuals & Warranty

ZWO 2-Years Warranty

ZWO General Product & Software Manuals

ZWO Narrowband Filters Transmission Curves

5 stars: 1 (100%)
4 stars: 0 (0%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 0 (0%)

ZWO 7nm Halpha fiter 1.25

Very happy with this ZWO 7nm Ha filter, No observable halo or artifacts in my images. A decent priced Ha filter without going too excessive on either price or bandwidth. Used with an F3.9 refractor and a Player One Neptune Mono bought from Astronomy Plus. Great Pricing, Quick shipping and Great communication by Astronomy Plus always keep my attention.

ZWO 7nm Narrowband SHO Filters (Ha, OIII & SII)

FREE SHIPPING FOR ORDERS OVER $500* 🆓🚚

We Have it in Stock? We're on it, shipping your order on the same day.

What if the product is not in stock?

🇨🇦 Canadian Authorized Dealer