My first test photos made using Nikon Series E 36-72mm f/3.5 manual focus zoom lens fiter with a Nikon BR2 lens reversing ring,which is then mated to a Nikon F lens mount to Canon EF body adapter ring and mounted to an EOS 20D. This setup focuses very close,and has a zoom feature. Most of these were shot with the lens set to f/5.6. All are hand-held kind of knock-around test shots and none used any electronic flash. it is fairly difficult to ascertain focus with the lens stopped down to f/8 at these fairly high magnification ratios,since f/8 is a relatively small aperture,and the view through the finder is "dim" at f/8,and focusing takes some practice and luck. Image quality is surprisingly good,I think, for such an oddball,off-list use.