Comments: This is the classic double star for small telescope. A Whitish yellow and Deep Blue companion lie widely separated in a field of faint, veil-like stars.
 

Ambience: The Sagittarius-area is an annual challenge for northern observers like me. Living at a latitude of 53 North means that Sgr rises only halfway above our horizon and that the visible part is always immersed in the grey skies of summer.
The best chance gives August, where we have some real darkness around midnight, but with Sgr already past its highest position.
July gives the possibility to view Sgr in the south, bu only in astronomicla twilight.
So every year I am hoping for a clear night around New Moon in July or August.

Fortunately the doubles give me the possibility to be a bit less specific about the conditions. 
On last saturday evening the more-than-half Moon was in Libra and the lower sky was far from being clear, but I took the challenge.
I went out to my low-horizon observing location with my CG-11 to have a look at some Sgr-doubles.
It was in more than one way a challenge. Not only to observe Sgr-objects but also to find out if I could use my ASC's succesfully in the field.
Well, after an afternoon and an evening with a very nice blue sky, the first thing I noticed when driving the car around the corner was a threatening bank of clouds along the northern horizon. Arriving at the location I noticed some small fog-banks in the fields. I suppose you know where this will lead to...

I had my scope set up, leveled and polar-aligned at 23.00. The only star visible below Altair was Antares, nothing else in that region...
ANd it only got worse. By the time astronomical twilight had set in there was cirrus all over the sky and I was up to my nose in thick ground-fog. At 23.45 I packed up and left, having some trouble to avoid a hegdehog on the road and having a nice view of a fox crossing the road a bit further on.
Nevertheless it was a succesful session (nicely accompanied by the calls of quails in the surrounding fields).
I had set out with only coordinates and not a load of star-charts; my targets were unknown objects in an unfamiliar part of the sky, and I managed to find quite a few. On two occasions I had the target right in the FOV of the C11 (using a 30mm Ultima, 93x). All other targets were well in the FOV of my finderscope (@ 19x).
On two occasions I stubled on the limitations of the ASC-method: When a target is not visible (too faint) or not recognizable (a close double in a field of similar stars) in the finderscope, I will need a chart to locate it or I will need to sweep through the area. 
This time I skipped those, realizing there was not much time left, and went on to some easier targets.

A limitation of this specific session was the very bad seeing in the lower sky (and maybe everywhere). I started with 21 Sgr, very easy to locate, but no split (1.8")...