NGC2244.Two of these three images of the Rosette Nebula reveal extra data taken using an Astronomik H Beta filter. I was using a 4 inch F /6.3 refractor , a Vixen Atlux mount , PH auto guiding , a set of Astronomik narrowband filters , HA , S11, O111 and H Beta . with an Atik 383L mono CCD camera . I captured five minute sub frames with matching dark frames and combined them with flat field and bias frames to reduce the effect of noise and vignetting in the final image. The total exposure time was 30 minutes using an S11 filter , 30 minutes using an O111 filter , 60 minutes using a H Alpha filter and 65 minutes using a H Beta filter
H-alpha H-beta bicolour
Hubble palette
Hubble palette plus H-beta
