Here is one i shot at 840mm -f/11-1/60s-iso320
I use full man. mode--spot meter--weighted tripod--timer--man. focus--mirror locked--exposure at +1/3 ot +2/3 ev, spot metering off the brightest spot of moon.
Depth of field isn't an issue, so use the aperature setting that your lens is sharpest. Usually f/8 for most lenses. I used f/11 because i had 2 teleconverter on and i loose 3 stops because of it.
Focus is very critical in getting a good shot. Shoot about a dozen shots so you can pick the one with the sharpest focus.