This is my image of the Eagle Nebula, Messier 16, which I captured on Sept 5 2018 and earlier using my C-11 SCT and ATIK460EX camera.  I captured M16 using a 3nm H-alpha filter, a 3nm O-III filter and a Luminance filter on the following dates; please note the exposure times for each filter and the number of frames per filter on the dates specified:

H-alpha:    Jul 31 & Aug 9 2017  13x10mins = 130mins

                  Aug 22 2017                 8x15mins = 200mins

                  Sep 4 2018                    3x10mins = 30mins

                  Sep 5 2018                    8x15mins = 200 mins

                 (Total HA = 560mins)

O-III:       Aug 1, 8 & 15 2017      20x10mins = 200mins

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Luminance:  Aug 13-14 2017       24x6mins = 144mins

 

 Total Integration Time = 904mins = 15 hours

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I captured but did not use 90 minutes of Red filter data.

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I used a star mask in Pixinsight to eliminate some of the stars because they were bloated due to the exposure times; that's why some the stars directly over the Pillars region of M16 and elsewhere aren't present in my image.

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In addition to the C-11 SCT and ATIK460EX main imaging camera, I used a Lodestar X2 guide camera, an On Axis Guider (ONAG), an F/6.3 Reducer, and a Starlight Instruments motorized programmable focuser control system, all components supported on a Losmandy

G-11 mount controlled by a Gemini 2 mount controller.