The choice of autofocus value for an image is the key factor to autofocus system of digital camera.
图像自动聚焦算法聚焦值的选择是数字相机自动聚焦系统的关键问题。
2
Some models allow autofocus in live view mode (without the mirror flips), but this is often a fairly slow process.
一些型号虽然在不改变内部镜片的情况下也可以做到自动对焦，但是通常也是个相对缓慢的过程。
3
To further complicate focusing, night scenes rarely have enough light or contrast to perform autofocus, nor enough viewfinder brightness to manually focus.