ZWO 1.25" Narrowband Filters - OIII, Ha orSII (Specify Type)

$129.00
Article number: NB125
Availability: More on the Way to us
Delivery time: More on the Way to Us

Narrowband filter do 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 narrowband 1.25″ filter

Size: 1.25″

Thickness: 5.5mm+3.5mm(thread)

Thread: M28.5*0.6 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 !

 

1-25ha

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.

 

1-25sii

The ZWO nrrowband O-III 7nm filter is designed for nebula observation allowing 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!

1-25oiii1

After set the filters into EFW, must sure that correct side of narrowband filters face to telescope and camera.

Narrowband

 

Technical Data

FWHM:7±0.5nm
Glass Thickness 1.9+/-0.03 mm  (1.25”/31mm/36mm)
Fine-optically polished to ensure accurate 1/4 wavefront  over the 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 )

here is the the transmission curve

HSO curve

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