![]() Disengages the linkage between the internal focusing mechanism and outer focusing ring when in the AF position. Have peripheral illuminations so are the ideal lenses for Digital SLR cameras, but are still suitable for 35mm SLR's.ĭual Focus. Large aperture lenses with wide angles and short minimum focusing distances. ![]() Lenses which have been designed so that the image circle matches the smaller size of the image sensor of most Digital SLR's. It can increase the focal length and will interface with the cameras automatic exposure function. These lenses can be used with the APO Teleconverter EX. ![]() APO Tele-Macros offer a 1:2 image size close focus, when the macro switch is engaged the zoom control ring is fixed at the telephoto end. APO Zoom Marcos offer up to 1:2 magnification (one half lifesize) in the telephoto range with instant shifting from normal to macro shooting. Uses special low dispersion glass for minimum colour aberration and telephoto quality improving contrast and sharpness. The are particularly good at correcting distortion in wide-angle lenses as well as contributing to a lighter and smaller lens design.Īpochromatic lenses. A type of lenses that virtually eliminates the problem of coma and other types of lens aberration. The codes below explain all the other letters DG IF ASP MACRO ASPĪspherical Lens Elements.
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