Mickoid
24-02-2019, 06:59 PM
This was just a test to see if I could capture the Pencil Nebula in Vela. With the moon rising only one hour after twilight ended, things had to go smoothly to capture as many subs as I could because this object is rather faint to say the least.
As I expected though, I ended up having alignment issues after levelling the tripod and mounting the head so when I polar aligned the mount and placed the counter weights on the shaft, I realised I hadn't tightened the altitude screws. The mount lowered with the weights attached so I had to take them off and start my alignment again. Adding to this, the one star alignment wasn't accurate enough for the GOTO to centre the object in the field of view, so this is a crop from the very top of the frame. Normally, I would have corrected this but I had no idea where the Pencil Nebula was because I couldn't see it on the first sub. I just let 20 subs roll out before the moon rose and hoped for the best.
I was lucky to get anything out of 16 x 1 min unguided exposures. At least I know I could do a lot better than this given more time!
Canon 550d, 1600iso, UVIR cut filter on a SW Esprit 100 and HEQ5pro mount.
As I expected though, I ended up having alignment issues after levelling the tripod and mounting the head so when I polar aligned the mount and placed the counter weights on the shaft, I realised I hadn't tightened the altitude screws. The mount lowered with the weights attached so I had to take them off and start my alignment again. Adding to this, the one star alignment wasn't accurate enough for the GOTO to centre the object in the field of view, so this is a crop from the very top of the frame. Normally, I would have corrected this but I had no idea where the Pencil Nebula was because I couldn't see it on the first sub. I just let 20 subs roll out before the moon rose and hoped for the best.
I was lucky to get anything out of 16 x 1 min unguided exposures. At least I know I could do a lot better than this given more time!
Canon 550d, 1600iso, UVIR cut filter on a SW Esprit 100 and HEQ5pro mount.