Sky-Watcher 1.25 inch O-III Filter: the specialist filter for planetary nebulae
The O-III filter only allows the light of doubly ionized oxygen (496 and 501 nm), exactly the lines in which planetary nebulae and supernova remnants shine. All other light is blocked: the background becomes deep black and the nebula stands out.
The Ring Nebula, Halternevel, and especially the Sluiernevel show detail with O-III that is unattainable without a filter. The filter is most effective on telescopes with apertures of about 150 to 200 mm; at smaller apertures the image becomes too dark.
Features
- Line filter: transmits only 496 and 501 nm
- Maximum contrast on planetary nebulae and supernova remnants
- Multi-coated, aluminum mount
Compatibility
Screws into the filter thread of 1.25 inch eyepieces and accessories. Usable for visual and photographic purposes.
Specifications
| Type | O-III line filter |
| Mount | 1.25 inches |
| Steeping material | Aluminum |
| Use | Visual and photographic |
| Central wavelengths | 496 to 501 nm |
The disassembly of Sky-Watcher is a base that will last you for years. Unsure which mount is best for your telescope and your goals? Contact us, we'd be happy to help you decide.
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