M8 (NGC 6523) is The Lagoon Nebula, visible to the naked eye and a fine object in binoculars and small telescopes.

This irregularly shaped nebula is twice the apparent size of the full moon. The brightest star here is 9 Sgr, a sixth-magnitude star slightly to the west of the nebula's centre.

The nebula is in the same field as mu Sagittarii: binoculars.

M20 and M21 are to the north of M8. M20 is called The Triffid; this nebula is large and fairly bright with a sixth-magnitude star at its northern edge.

M21 is a star cluster of about 50 stars, one degree northeast of M20.

The much more pleasing M23 is at the northern edge of your field of view.