I routinely brace the lens against any nearby support. If there is a convenient light pole, for example, I brace the body and the lens against the roundness of it, given me two points of contact. I can support quote low shutter speeds that way, with better results than with a monopod.
If you can find a bench or railing, you can brace your elbows there hold the camera, which takes out much of the effect of body movement. A car door also works. I recently made some images for work to perform line-of-sight surveys for microwave links, using my 70-200/4L. I was able to easily resolve an 8-foot microwave dish at a distance of 7 miles. The dish was four pixels wide. I braced the lens on my hands, with my elbows braced on the side of a bucket on a 65-foot bucket truck. I'm afraid of heights--there was considerable natural shaking going on!
First image is full image downsampled to fit, and the second is a 100% crop, both unprocessed outside the camera (except for re-JPGing after resizing or cropping). The fuzziness in the image atmospheric, what astronomers would call bad seeing. The detail is cropped from a spot about 15% in from the left edge. Even with bracing, I used 1/1000 after bumping the ISO to 400. Without the bracing, though, the images showed movement even at that shutter speed. I shouldn't have drunk so my caffeine that day, heh, heh.
Rick "recalling that three contact points are required to make a stable structure" Denney
HOSTED PHOTO
please log in to view hosted photos in full size.
HOSTED PHOTO
please log in to view hosted photos in full size.