Rube Goldberging it
Brandrx's experiments with his gear have inspired me to do the same with mine. Yesterday I went out to the back yard to shoot goldfinches with this outfit:
Pentax F* 300mm f4.5 + Kenko P-AF 1.5x converter + K-01 + Hoodman loupe, mounted on a Manfrotto lens/camera cradle atop a heavy old Quantaray tripod.
Got this one (cropped about 20 or 30 per cent; I don't know how to measure crop percentages, so that's just a guess):