 Lenses with equal or shorter back-focus (pre-EOS Canon, Minolta, Konica, Miranda) can only be adapted by discarding the old bayonet, milling off extra metal from the lens barrel and adding an SA = PK bayonet flange.Due to the good quality viewfinder (for a crop-DSLR) of the SD14 the missing auto-iris is not a problem, and primes from 45mm up focus comfortably on the screen down to f/5.6.The camera meters automatically via the AV setting with anything mounted on it or being mounted on, such a microscope or a telescope.