Well I decided to try out stacking the DCR-250 and the +3 lens from the DCR-5320. At about 8X zoom you get aprox. the same magnification as the DCR-250 at 12X by itself. I was having some trouble getting anything, because of the long exposures with the aperture set at F8. Thanks to a light breeze and a 1/2 sec exposure I missed a shot of this fly blowing a bubble. After that the fly moved to another branchand I set up again and got a couple of acceptableshots and a short video.
F3.3, 354mm (aprox. 10x), 1/15 sec, cropped from 2816x2112 to 1024x1024
F8, 256mm (aprox. 7X), 1/2 sec., cropped
Here's a link to the video Youtube's compression really screws up the detail but I don't know of anywhere else to host it.