iOptron Filters OIII 1.25" (87504)

This narrowband line filter is designed for astrophotography, specifically to enhance the visibility of emission nebulae by isolating key oxygen emission lines. By suppressing unwanted background light, it increases contrast and reveals fine structural details in nebulae. The filter is optimized for imaging rather than visual observing and is best suited for deep-sky photography under light-polluted or dark-sky conditions.

Technical specifications:
Central wavelength: 495.9 nm and 500.7 nm
Half-value width (FWHM): 7 nm
Filter size: 1.25 inches
Mount material: Aluminum
Optical coating: Multiple layers
Telescope connection: 1.25 inches

General information:
Type: Filter
Build type: Line filter

Areas of application:
Suitable for astrophotography: Yes
Visually useful: No
Twin stars: No
Moon and planets: No
Nebulae and galaxies: Yes