Pegasus Astro Photographic Filter - OIII 2'' Mounted Filter (PEG-FLTR-2M-O3)

The Oxygen III (OIII) CCD 7nm filter is designed for nebula observation allowing 7nm bandwidth of light centered on a wavelength of 500nm which corresponds to OIII emission lines. This reduces the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, high and low pressure sodium vapor lights, and the natural light caused by neutral oxygen emission in our atmosphere (i.e., skyglow). OIII narrowband filters allow only a small portion of light to pass through the filter, resulting in diffuse and planetary nebulae to appear more clearly against a blacker background of space.

Technical Specification

• Specifications
  Filter Size:	2 inch
  Polish:	1/4 wavefront, Parfocal
  Transmission Range:	T > 80% 500 nm, 7nm FWHM
  Coatings:	Multilayer Anti-reflection
  Type:	Narrowband (7nm)
  Shape:	Round
  Thickness:	5mm (filter) + 2.5mm (thread)
  Thread:	M48, 0.75 pitch

In the Box

Filter

Manual & Warranty

Pegasus 1-Year Warranty