ZWO 36 mm H-Alpha 7nm Narrowband Filter - Ha7nmD36

The ZWO H-Alpha filter has a bandpass of 7nm and passes light at the 656nm wavelength, with a light transmission rate of up to 80%. This is the best choice for a narrowband H-alpha astrophotography filter if you are doing high-contrast imaging and want to reveal rich details of the nebula even in areas with strong light pollution.

This ZWO Ha 7nm Filter has a diameter of 36 mm and comes unmounted.  You can use it in 36 mm filter wheels.

Do not use this filter for viewing or photographing that Sun; eye and/or equipment damage could occur.

How to Use the ZWO Hydrogen-Alpha (Ha) 7nm 36 mm Filter...

• A Hubble look can be made by the combination of H-alpha, OIII-CCD and SII-CCD, such as the famous “Pillars of Creation” (M16 Eagle Nebula)

• Narrowband imaging with SHO set (H-alpha, OIII-CCD and SII-CCD) can be done with the moon in the sky so your equipment is not sitting dormant until the next new moon.

• An H-alpha filter is the first narrowband addition to an LRGB set for most imagers who want to blend a black-and-white Ha image into RGB data to enhance structural detail while maintaining natural look.

Specifications

• Size: 36 mm Diameter

• Thickness: 2 mm

• Mounted: No, comes unmounted

• FWHM：7±0.5nm

• Fine-optically polished to ensure accurate 1/4 wavefront over the both surfaces

• About 90% transmission at H-alpha line 656nm

• Infrared wavelength 700-1100nm cut-off

• <0.1% transmission of off-band, OD3 (Optical Density)