I found that as focal length got shorter, the minimum magnification using the bellows was too much to get the entire chrome projected onto the APS-C sensor. To project a standard 35mm slide onto a FF sensor, obviously you need a 1:1 ratio = life size reproduction, and the bellows + slide copier is designed to accomplish this.. For an APS-C sensor, you need about a 1.5:1 ratio = about 2/3 life size. If a longer FL lens is on the bellows, even a 50mm lens, and this is moved back to provide the requisite lower than 1X magnification, then the bellows of the slide holding device will not stretch enough to permit focus to be achieved. With the X-frame bellows and devoted slide copy attachment, full coverage of a 35mm slide on an APS-C sensor is not possible with any focal length lens 35mm to 100mm. If it were possible to move the slide farther from the front element of the lens being used on the bellows, slide conversion onto an APS-C sensor could be achieved, but the bellows of the slide holding device cannot stretch that far.. Modifying the rig in some way, well, fiddle until you have the requisite combination, but for that, I could use one of my several macro lenses and a light box of some kind on a copy stand rig, dispensing entirely with the bellows. However the bellows has the advantage of reliable registry of slide and sensor (parallel, centered, correct focal distance maintained), and no light leak between slide and sensor.
Last edited by WPRESTO; 06-07-2016 at 11:08 AM.