Cone Nebula with Ha!
I wasn't happy with how my RGB only Cone Nebula turned out so I got a night's data of hydrogen alpha (Ha) using a 12nm Ha Astronomik filter. The difference in exposure between RGB and Ha, even 12nm, is huge, I went from 10 minutes at ISO200 to 20 minutes at ISO1600 and was still a bit underexposed in the Ha. Anyway, I used the Ha data as 25% luminance in APP, makes quite a difference! Nikon D810A, 600mm focal length, f/4 focal ratio, ISO1600, 20 minute subs, Celestron CGEM2 mount, PHD2 autoguiding, APT camera control, APP for stacking and initial processing including star reduction, final processing in Photoshop.
Cone Nebula with Ha!
I wasn't happy with how my RGB only Cone Nebula turned out so I got a night's data of hydrogen alpha (Ha) using a 12nm Ha Astronomik filter. The difference in exposure between RGB and Ha, even 12nm, is huge, I went from 10 minutes at ISO200 to 20 minutes at ISO1600 and was still a bit underexposed in the Ha. Anyway, I used the Ha data as 25% luminance in APP, makes quite a difference! Nikon D810A, 600mm focal length, f/4 focal ratio, ISO1600, 20 minute subs, Celestron CGEM2 mount, PHD2 autoguiding, APT camera control, APP for stacking and initial processing including star reduction, final processing in Photoshop.