ZWO 7nm Narrowband SHO Filters
Best specialized optics for capturing detailed deep sky objects.
These narrowband filters are designed to increase contrast between nebulae and the night sky by reducing the transmission of specific light wavelengths produced by artificial sources and natural skyglow. The H-Alpha filter has a 7nm bandpass centered at 656nm with up to 90% transmission, ideal for high-contrast imaging. The S-II filter passes light at 672nm with a 7nm bandpass, suitable for visual observation and tricolor CCD astrophotography. The O-III filter has a 7nm bandwidth centered on 500nm, corresponding to OIII emission lines, allowing for unique imaging of nebulae regardless of light pollution. Combining these filters enables the creation of detailed images and facilitates narrowband imaging even with the moon present.
$380.00
More Narrowband Filter Options
ZWO 2-Inch Narrowband Filter Set - 7nm
$699.00
ZWO 1.25-inch H-alpha SII OIII 7nm Filter Set
$369.00
ZWO H-Alpha 7nm CCD Filter
$299.00
ZWO 31mm Ha 7nm Narrowband Unmounted Filter
$149.00
ZWO Narrowband SII 7nm 36mm Filter
$175.00
ZWO 1.25" Narrowband Filter Set
$449.00
ZWO 31mm H-alpha Filter - 7nm
$149.00
Owner Satisfaction
4.7
/ 5
Category Rank
607
/ 2593
#607 in Telescope Accessories
Price vs Category Average
-43%
Below average
FWHM
70.5
/ ±nm
Who it's for
- Astrophotographers capturing deep-sky objects from bright city skies
- Deep-sky imagers focused on artistic and scientific nebula compositions
- Imagers prioritizing high-fidelity data from challenging celestial targets
Who should skip it
- Astrophotographers desiring versatile equipment for various celestial subjects
- Imagers with limited imaging time or seeking quicker results
- Budget-conscious beginners or casual observers exploring astrophotography
Key Specs
FWHM
7±0.5nm
Glass Thickness
2.0+/-0.03 mm
Transmission
90% at H-alpha, SII, and OIII lines
Off-band transmission
<0.1% (OD3)
Infrared wavelength cut-off
700-1100nm
Polishing
1/4 wavefront over both surfaces
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