Richard,
The adapter is fitted over the eyepiece, and (you're right) the camera just held in place. This can be done with one hand, while keeping the bird framed with the other. The lens fits in the adapter to the shoulder of the first lens segment, and (serendipity) clears the surface of the eyepiece. Slight extra tightening of the tripod head adjustments assists with framing. The camera is set on spot metering, its highest resolution and ISO.
With the adapter on, I focus the scope -- usually at 20x -- before putting the camera in place, relying on luck and depth of field, since the LCD screen is washed out in most daylight conditions. The camera is set at 3x optical zoom to avoid vignetting. It seems to take 30-40 photographs to get a half dozen to finally pick from.
The functional advantage of this set-up is that you can quickly and effectively go from birding to digiscoping and back again, with the camera and adapter in a pocket.
The main problem with the Olympus 500 is hand movement, resulting in relatively soft images. Our next camera will probably be a Fuji F30, in order to get faster shutter speeds.
It helps to have a cooperative bird.
BTW, you'll love Pelee; we've been going there in May for a few years. The warblers will not disappoint you. If you're not close to a sports optics retailer where you live, don't miss the Pelee Wings Nature Store on the way into the park, where you'll find all the latest stuff <
www.peleewings.ca >.
Mike