Introduction to Canon MP E65 Macro Lens
Introduction to Canon MP E65 Macro Lens | ||
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This unique lens is a manual-focus macro lens, designed only for magnifications between 1× and 5×, without the use of any additional accessories. It achieves this remarkable range by having a built-in extendable extension tube. It is a difficult lens to master—at 1× it is 100 mm (4 in.) away from the subject and at 5× it is just 40 mm (1.6 in.) away, leaving little room for creative lighting. The lens extends from around 100 mm (4 in.) at 1× to around 230 mm (9 in.) at 5×. There is no focusing ring; to use the lens you need to preset the magnification required, then move the whole camera/ lens assembly until focus is achieved. This will probably require some sort of focusing rail to achieve the minute movement required. The lens can even be used for some specimens mounted as microscope slides. Depth of field (DOF) at these high magnifications is very small but a couple of examples are shown here to illustrate the problem: 1×: f/2.8: DOF: 0.4 mm 5×: f/2.8: DOF: 0.048 mm It would not be a good idea to stop down the lens to f/16 at a magnification of 5×, as the image quality would suffer from the effects of diffraction. | ||