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This is my image of the Trifid Nebula (M20 which I captured with a C-11 SCT in L_HA-R_OIII_B on the following dates including filter exposure times and number of frames per filter on each day:
H-alpha: Sep 4/5 2017: 13x5mins = 65mins
Sep 9/10:  15x5mins = 75mins
Total = 140mins

O-III: Sep 7 2017:  4x10mins = 40mins

Red: Sep 20 2017:  13x6mins = 78mins

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Blue: Sep 16 2017: 16x5mins

Sep 17 2017: 15x5mins

Sep 19 2017: 19x6mins

Sep 24 2017: 8x12mins

Total = 365mins

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Luminance: Sep 15 2017: 18x5mins + 1x4mins

Sep 23 2017: 15x6mins

Total = 184mins

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Total Integration Time = 807 minutes = 13.45 hours

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

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