Explore Scientific Filters 2" OIII filter (54041)

OIII filters allow only light with a wavelength of 501 nanometres to pass through. This corresponds to the spectrum lines for double ionized oxygen. These lines are emitted by planetary nebulae and some emission nebulae, allowing these objects to remain visible while the rest is blocked out by the filter. This effect increases contrast and makes faint nebulae visible for the first time.

Astrophotography

These filters are best used with monochrome cameras. Ideally, images taken using these filters should be combined with images using H-alpha and SII filters. This creates an image that depicts faint nebulae clearly and with high contrast.

Specifications

Capacity

• Connection (to the telescope): 2"

• Mount material: Aluminium

• Coating of optical system: Multiple

• Frame: 2"

General

• Series: Filter

• Type: Filters

• Type of build: Line filter

Area of application

• Visually useful: Yes

• Anti light-pollution: Yes

• Useful for photographs: Yes

• Planetary nebulae: Yes

• Nebulae & galaxies: Yes

• Supernova remains: Yes