Open Box ZWO 31mm OIII 7nm Filter
Passes 7nm bandwidth of light centered on a 500nm wavelength, which corresponds to OIII emission lines. All other light is blocked.
Adding a ZWO O-III Narrowband filter to your imaging collection will take you beyond RGB imaging and reveals your favorite nebulas in a totally new light, no matter how polluted your skies may be!
- FWHM: 7±0.5nm
- Glass Thickness 2.0+/-0.03 mm (1.25”/31mm/36mm)
- Fine-optically polished glass ensures accurate 1/4 wavefront over both surfaces
- Approx 90% transmission at major OIII line 500nm
- Infrared wavelength 700-1100nm cut-off
- <0.1% transmission of off-band, OD3 (Optical Density)
|Warranty||90 Day Covered By OPT|
- ZWO OIII 7nm filter
- Plastic case, wrapping and outer box