Staying with the Cygnus and narrowband theme, here’s last nights effort. This was taken on the Atik 314L+ through an old 50mm f/1.7 Pentax lens stopped down to f/2.8, and used 10 x 3min Ha, 11 x 3min OIII, but I only got 4 x 3min SII before the cloud rolled in. Processing for this was done in AstroArt and Photoshop.
A while ago now I acquired a Geoptik adapter to fit Canon lenses directly to the Atik, the beauty of this adapter being that 1.25″ filters can be used with it. I was able to connect my 200mm Canon and 105mm Sigma lenses to it OK, but wider angle 50mm and 28mm lenses couldn’t be brought to focus. In my lens collection are a couple of old Pentax K bayonet lenses – a 28mm f/2.8 and a 50mm f/1.7; I got a cheap Pentax K to Canon adapter, and last night tried these lenses out on the Atik. The 28mm wouldn’t focus, but the 50mm was fine 🙂
These are two quick images that I took. The first is a region of central Hercules which includes M13, just right of centre; it’s a stack of 6 x 2min exposures at f/4 through an Astronomik CLS filter. The second is of the region aroun the North America and Pelican nebulae, and is a stack of 10 x 2min exposures, binned 2×2, through a hydrogen alpha filter. Accurate focusing is a lttle tricky, but the results are good enough to persuade my to try further with this lens.
A bit more exposure would have helped, but I was quite pleased by how much detail I was able to tease out of it, nevertheless. Guiding worked flawlessly, possibly helped by the fact that I’d spent a bit of time improving my polar alignment.