On the advice of several online reviews and discussions -- including some threads on Photo.net -- I purchased a Nikkor 40mm f/2.8G Micro lens and Nikon ES-1 slide-copying attachment. The reviews and discussions claimed that this combination is perfect for copying 35mm slides with a DX-format DSLR. But I immediately discovered that the entire slide cannot be photographed. A large part of the top is chopped off, even after extending the ES-1 tube to its full length. Back to the Internet. Additional sources claimed that inserting a 20mm extension between the macro lens and the ES-1 allows the entire slide to be photographed. This extension requires a Nikon K5 tube, which was formerly supplied as part of a Nikon extension-tube set. The K5 tube is threaded for 52mm male on one end and 52mm female on the other. It fits between the macro lens and the ES-1 (which are both 52mm threaded), not between the camera and the lens. Nikon no longer sells the K5 tube, so I purchased a used one on eBay. Another fail! This combination still does not allow the 40mm lens to photograph a whole slide. The top is still cropped off. It doesn't seem logical that everyone else is getting different results than I am from the same equipment. So next I checked my DSLR for parallax error. (Years ago I had a film SLR that suffered parallax error after the pentaprism was damaged.) But my DSLR's viewfinder is accurate. The problem is that the 40mm/ES-1 combination doesn't allow the slide to be centered in the viewfinder. There is a significant amount of slide mount at the bottom and a significant amount of cropped image at the top. Yet the slide cannot be pushed down any further into the ES-1's holder. The metal clips prevent it. Trying to force the slide further into the holder only breaks the slide. Is anyone out there actually using this combination to copy slides? Have you noticed if you're losing image area at the top or bottom? I prefer to hear from people who are ACTUALLY USING this combination, because I'm beginning to suspect that some folks are just assuming it works -- or maybe they don't notice that their slide copies are cropped. It's a mystery.