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加上增距镜后,如果镜头最大孔径缩小到f/8,那么几乎所有的数码单反相机只能采用手动调焦了,而唯独一种数码单反相机依然能实现自动调焦……增距镜可以轻松将镜头的焦距延长,但是加上这种附件后镜头的实际通光量都会大打折扣,很多情况下会造成相机自动调焦失效。到目前,绝大多数自动调焦相机只支持最大孔径为f/5.6(实际为f/6.3)镜头的自动调焦,唯独佳能EOS王朝中的顶级相机例外。早在胶片时代,佳能研发人员就对EOS顶级“1”系列相机的中心调焦点进行了特殊设计,从而让它们具备了世上独一无二的功能——即便装上
Coupled with the teleconverter, if the lens maximum aperture reduced to f / 8, so almost all digital SLR cameras can only be manually adjusted, and only a digital SLR camera still able to achieve autofocus ... ... distance The lens can be easily extended the focal length of the lens, but with this attachment the actual lens aperture will be greatly reduced, in many cases will cause the camera to automatically focus failure. To date, most autofocus cameras only support autofocus with a maximum aperture of f / 5.6 (actually f / 6.3), with the exception of the top camera in the Canon EOS dynasty. As early as the film era, Canon developers made a special design for the center of focus of the EOS Top “1 ” series of cameras, giving them a unique feature in the world - even with