ZWO 2'' SII 7nm Narrowband Filter
  Zoom

ZWO 2" SII 7nm Narrowband Filter

£249.00✓ 2 year warranty

:  

Usually shipped 7-10 working days.
Request a Price Match

About this product

Model:  zwo_sii_2
Part Number:  ZWO-SII7nm2

New 2" ZWO SII Narrowband Filter

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.

Narrowband filters 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 vapour, and both high and low pressure sodium vapour lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).

Form 2018, ZWO Made a progress on narrowband filters with the new standard, provide better performance.

FEATURES

  • FWHM:7±0.5nm
  • 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 )
  • Infrared wavelength 700-1100nm cut-off
  • <0.1% transmission of off-band, OD3(Optical Density)

Transmission Curve

Specifications

  • Size: 2″
  • Thickness: 5mm+2.5mm(thread)
  • Thread: M48.5*0.75 male thread

Customer reviews

Be the first to Write a Review for this item!

FAQ

Please fill in the form below to ask a question or request a price match.

*
Your Name:
*
Your Email Address:
*
Your Question / Request:
URL of the Cheaper Price:
If you are requesting a price match please let us know the URL where you have seen the product cheaper.