Provided that there is enough light forthe lens to focus without an AFassist beam, lenses with a rearfocus optical design, such as the EF 85mm f/1.8 USM, will focus fasterthan lenses that move their ... According to Canona#39;s 5D manual, you can.
|Title||:||Canon EOS 5D Digital Field Guide|
|Author||:||Charlotte K. Lowrie|
|Publisher||:||John Wiley & Sons - 2012-07-02|