iOptron OIII 1.25″ Filters: OIII narrow band filter of 7 nm
This narrowband filter transmits only the blue-green light of ionized oxygen, at 495.9 and 500.7 nm. Planetary nebulae, supernova remnants, and the oxygen-rich regions of emission nebulae glow brightly in it.
With a half-width of 7 nm, street lighting and moonlight are kept out of the image. Fine filaments and faint shells that are invisible in broadband become photographable this way, even from the city.
Second channel of each palette
OIII, together with H-alpha, forms the HOO palette, and with H-alpha and SII, the Hubble SHO palette. The 1.25-inch aluminum cell fits into standard filter wheels.
Included
- OIII filter, 1.25″ format
Featured accessories
Combine with the iOptron H-alpha and SII filters for the full Hubble palette.
For whom yes and for whom no
- ✓ Monochrome photographers of planetary nebulae and supernova remnants
- ✗ Visual observers: choose a visual OIII filter with broader transmission
Specifications
| Emission lines | OIII, 495.9 and 500.7 nm |
| Half-value width | 7 nm |
| Format | 1.25-inch aluminum vatting |
| Observation goals | Narrowband photography with monochrome cameras |
You can find more mounts and accessories for this brand at the iOptron brand page.
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