ZWO H-alpha (Ha) Narrowband 7nm Filter 1.25" (ZWO-HA7NM1.25) Eyepiece The removable dec assembly allows

The removable dec assembly allows for the use of Star Adventurer L-brackets or ball head adapters

it can be used also with scopes with a high focal ratio

3 focal reducer for even more astroimaging options

It is compatible with all ZWO 2" filters

75 male thread

ZWO H-alpha (Ha) Narrowband 7nm Filter 1.25" (ZWO-HA7NM1.25) Eyepiece The removable dec assembly allowsNarrowband filter does not eliminate the effects of light pollution or increase the objects brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula. The ZWO H Alpha filter has a bandpass of 7nm and passes light at 656nm wavelength, light transmission rate comes up to 80%. Best choice of narrowband H alpha astrophotography filter for high contrast imaging and revealing rich details of the nebula