ZWO Hydrogen-Alpha Ha Filter - 31mm - HA7nmD31
ZWO has discontinued the Hydrogen-Alpha Ha Filter - 31mm - HA7nmD31, and we are out of stock. Here is a link to the ZWO H-Alpha 7nm CCD Filter - 1.25" we carry at High Point. If we can be of further assistance, please don't hesitate to call us at 1-800-266-9590 or send an email, and we will be happy to help you. Thank you!
ZWO Hydrogen-Alpha Ha Filter - 31mm - HA7nmD31
The ZWO H-Alpha filter has a bandpass of 7nm and passes light at 656nm wavelength, the light transmission rate comes up to 90%. Best choice of narrowband H-alpha astrophotography filter for high-contrast imaging and revealing rich details of the nebula even in areas with strong light pollution, just prepare to experience the infinite fun with it!
Specifications
- FWHM：7±0.5nm
- Glass Thickness 2.0+/-0.03 mm
- Fine-optically polished to ensure accurate 1/4 wavefront over the both surfaces
- About 90% transmission at H-alpha line 656nm (H-Alpha filter )