I'm using my EF 500mm f/4L IS on my 7D with the EF 1.4x TC and the EF 25mm ET for bugs and close birds. I'm very pleased with the DOF and ease of working distances and wondering what my magnification potential is. It looks like it's close to 1-to-1 when the subject gets in close.
My question is, what is the maximum magnification of this rig? 1.6-crop sensor body, 500mm lens, 1.4x TC and 25mm extension tube. I know, I could shoot some test shots and measure a 4x6 print, but I'm hoping that someone here knows.
Thanks,