SII 6.5nm 36mm Narrowband Filter
Extra narrowband SII-CCD 6.5nm filter (Sulful II for CCD) is designed for nebula observation allowing 12nm 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).
  • Description

  • Specification

1. Optolong SII 6.5nm Narrowband Introduction

  • Use with H-alpha and OIII-CCD narrowband filters (SHO Set) for tricolor CCD astrophotography. Narrowband  imaging  with  SHO  set  (H-alpha, OIII-CCD  and  SII-CCD)  can  be  done  with  the moon   up   in   heavy   light   pollution,   so   your equipment  is  not  sitting  dormant  for  several weeks.
  • Hubble look of images can be made by the combination of H-alpha, OIII-CCD and SII-CCD, such as the famous “Pillars of Creation” (M16 Eagle Nebula).
  • 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.

2. Referance Spectrum



3. Packing

  • Outer Box: silve box
  • Plastic Box: PP material
  • Lining: imported high pressure white EVA material

4. Filter Performance


photo by Fabian Rodriguez


5. Warm Reminder:

  • About Color: The package may different due to different photography environment, lighting. What you have seen in the picture is absolutely what it is being. You might feel somewhat of color different subject to the monitor and camera, please refer to the material item.
  • About Coating: The interference items will show rich colors in different light environment, which is normal phenomenon.
  • About Product Object: Product specifications may change to improve product quality, and that updates to the specifications will be published as soon as possible.
  • About Product Overview: Please note that H-Alpha 7nm filter with same design, same raw material . Size is the only difference.

Available Size:

  • 1.25";
  • 2";
  • 31mm;
  • 36mm;