Can the R3 work with old Canon lenses, i.e. the MK1 lenses such as the 300 f2.8 L IS USM and the 500 f4.0 L IS USM? If they can does this combination have any effect on: - image quality - burst rate (fps) - IS functionality - AF functionality Or any other performance issue. The canon website say they are usable with no losses in functionality, but is this actually true? thanks Victor
