Explore Scientific Filters OIII 6.5nm 2" (77340)

OIII filters are designed to allow only light with a wavelength of 501 nanometers to pass through. This specific wavelength corresponds to the spectrum lines of double ionized oxygen. Planetary nebulae and some emission nebulae emit these lines, enabling these objects to remain visible while the filter blocks out other light. This effect significantly increases contrast and makes faint nebulae visible for the first time.

Astrophotography

These filters are most effective when used with monochrome cameras. For optimal results, images taken using OIII filters should be combined with images captured using H-alpha and SII filters. This combination creates a final image that clearly depicts faint nebulae with high contrast.

Specifications

Capacity

• Central wavelength: 500.7 nm

• Half-value width: 6.5 nm

• Frame: 2"

• Mount material: Aluminium

• Coating of optical system: Multiple

• Connection (to the telescope): 2"

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