These photos by Arturo Jacoby of Clairmont Camera, Hollywood show their new Canon EOS 1D Mk IV modified with PL mount to accept all lenses. What’s the difference between this camera and a 7D? The 1D has an APS-H sensor (27.9mm wide x 18.6mm high). The 7D sensor is APS-C (22.3mm x 14.9mm). And what’s 35mm four-perf? Full frame is 24mm x 18mm, and Silent Aperture is 24.9mm x 18.7mm. So the 1D with its APS-H sensor comes closest. For rental only.