This is a wide 3 frame mosaic of the Lagoon nebula (On the right) with NGC 6559 (on the left)
Just at the edge of the image at the bottom is the cluster NGC 6554.
This area is about 3X2 degrees of the sky.

The original image is 8014X5366 pixels - here it is downsampled by 2 to 4007X2683.


Please see next frame for Ha plane only.

Each frame of the mosaic:

Ha - for 1 HR
O3,S2 - 30 min (Bin 2)
RGB 15 min each (Bin 2)
Total of 2:45 HRS per frame

Grand total of about 8 hrs

Imaged with the 16" f3.75 Dream Astrograph.
Apogee Alta U-16M camera.

Imaged from Tivoli farm in Namibia 2015