Explore Scientific Filters SII 6.5nm 1.25" (77345)

The Explore Scientific SII 6.5nm 1.25" filter is a specialized astronomical filter designed for observing and imaging specific types of nebulae and deep-sky objects. This narrowband filter isolates the emission line of singly ionized sulfur (SII) at 672 nanometers, allowing astronomers to capture detailed images of emission nebulae, planetary nebulae, and supernova remnants. With its narrow 6.5nm bandwidth, this filter effectively blocks light pollution and other unwanted wavelengths, significantly enhancing the contrast and visibility of sulfur-rich structures in celestial objects.

Specifications

Capacity

• Central wavelength: 672 nm

• Half-value width: 6.5 nm

• Frame: 1.25"

• Mount material: Aluminium

• Coating of optical system: Multiple

• Connection (to the telescope): 1.25"

General

• Type: Filters

• Type of build: Line filter

Area of Application

• Useful for photographs: Yes

• Visually useful: Yes

• Twin stars: No

• Moon & Planets: No

• Nebulae & galaxies: Yes