These are photos of a centimeter ruler with the Canon 100mm f/2.8 macro lens set at 1:1 on a Full Frame 35mm DSLR (Canon 5D), with Kenko extension tubes, Canon 2x Teleconverter, reversed 50mm f/1.4 lens and a Canon MP-E 65mm f/2.8 1-5x lens. Also included one with my old 10D (an aps-c sensor [1.6] DSLR) and a bellows with 50mm lens.
Photos were resized to fit on screen (no cropping was done).
Kenko 1.4 TC & 100mm lens
68mm tubes & 100mm lens
2x TC + 12mm tube & 100mm lens
2x TC + 68mm tubes & 100mm lens
100mm lens & Reversed 50mm f/1.4
2x TC + 12mm tube + 100mm lens & 50mm f/1.4 reversed