Hi all
Just want to understand proper exposure. Below are two images of the Lagoon Nebula taken at different locations (Bortle 5 and Bortle 3) with different exposures.
I took the one at a Bortle 5 site first, wasn't happy and went to a darker site to take the second as I wanted better exposure.
Bortle 5 image
ISO 800, 90 seconds
Bortle 3 image
ISO 2500, 120 seconds
I'm trying to understand why the histograms are both so close to the left. I was aiming to get the second histogram over to the right so I could stretch the image. The ISO is 3 times more sensitive, and the shutter speed is 1.3 time slower. Same scope.
How on earth do I get that histogram over to the right so I can edit it better? I can't push my stacked files at all because the histogram is so close to the left
Cheers
Adam