H-Alpha 7nm filter ZWO 2"

H-Alpha filter 7nm ZWO 2"

Narrow band filters are able to isolate a single line of the visible spectrum, to study closely celestial objects with strong emission in that color, so they are particularly suitable for observing emission nebulae and Supernova remnants. In this case, it is the famous alpha line of the hydrogen spectrum, in which many nebulae emit, because the nebular hydrogen is in an excited state due to the energy it receives in the form of high-frequency light from neighboring stars. In order to switch to the normal state, the hydrogen gives off its additional energy by emitting light of a certain frequency, the equivalent of the H-alpha line, which you can now study in detail with the H-Alpha 7nm filters from ZWO, offered by Telescopiomania.

Its high transparency in the H-alpha emission line (656nm) together with its low off-peak transmission, make it a filter that provides a high contrast, accentuating spectacularly the details of the emission nebulae, always taking into account that nebular filters do not increase the brightness of the object to be observed, but they do increase the contrast between the nebula and the night sky; among other reasons, because by not allowing other wavelengths than H-α to pass through, it becomes an effective barrier against stray lights (light pollution and natural celestial brightness caused by the emission of neutral oxygen in our atmosphere).

WARNING: This type of H-alpha filter is not designed for solar observation. NEVER DIRECT YOUR TELESCOPE TOWARDS THE SUN WITH THIS FILTER; you are in danger of being BLINDED if you fail to observe this warning.

H-Alpha 7nm filter ZWO 2"