| Brand | ZWO |
|---|---|
| Type | Filter |
| Size | 1.25 in |
Check the listing for details. ZWO OIII 7nm Filter - 31mm (LIMITED QUANTITIES). Condition: New. Listed at 149.00 USD. OIII, or doubly ionized oxygen, emits light in the blue/green, or teal portion of the spectrum near 500 nm. Planetary nebulae and supernova remnants emit most of their light in the OIII line. OIII is considered the second most popular narrowband imaging filter (behind H-a), and when used in conjunction with H-a and SII, your images will get that tri-color "Hubble Look".
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