Askar Colour Magic OIII narrow band filter 3 nm 2 inch for night photography

Do you want to capture the blue-green parts of a nebula, even if you don't live under a dark sky? The Askar OIII filter of 3 nm only allows a narrow band around the OIII line of oxygen to pass through. Almost all other light is blocked out.

Especially planetary nebulae such as the Ring Nebula and the Halley Nebula, and supernova remnants such as the Pleiades Nebula, come strongly to the fore with this. Together with H-alpha and the SII filter of 3 nm When you build color images with a monochrome camera, you need to change the settings often. If you do that, you save money. a filter wheel for seven 2-inch filters A lot of hassle.

OIII is more sensitive to moonlight than H-alpha. Plan your exposures preferably when the moon is low or is far from your object; in The lunar calendar You can see when this is the case. With a very powerful telescope, it is advisable to check whether a 3 nm filter is suitable for this. This filter is not intended for the sun.