Sagittarius cluster M22

[Nerf_Caching]

Taken with a Canon 650d dslr attached to Skywatcher evostar 72ED refractor. Mounted to Nexstar 4/5se mount using alt-az tracking. 99x30 seconds at ISO 800.

[macupnorth]

Hi,great picture! Do you need a 2 inch extension tube to achieve focus when attaching a DSLR to the 72ed?

[Marvin Jenkins]

This not intended as a criticism at all as your picture is excellent but what is the cause of the left side appearing to be green then shifting to red on the right? Other than the sky actually looking like that of course.

[Nerf_Caching]

On 27/07/2019 at 14:58, Marvin Jenkins said:

This not intended as a criticism at all as your picture is excellent but what is the cause of the left side appearing to be green then shifting to red on the right? Other than the sky actually looking like that of course.

It's been happening to some of my images as I have to deal with some pretty horrible light pollution gradients. I'm still quite new to editing with GIMP and as such I don't have a concrete solution to dealing with the strange star colors.

[Nerf_Caching]

On 27/07/2019 at 05:58, macupnorth said:

Hi,great picture! Do you need a 2 inch extension tube to achieve focus when attaching a DSLR to the 72ed?

Actually, my way of extending the focuser is pretty crude. As I don't have any 2 inch accessories, I got a 2 to 1.25 inch adapter off amazon and paired it with a barlow lens with the barlow element replaced with a normal 1.25 inch barrel so it acts purely as an extender. Extension tubes are necessary for the 72ED in order to achieve focus with a dslr.

Edited July 28, 2019 by Nerf_Caching

[MarsG76]

Nice pic of one of my favourite globulars to observe.