This ability was added in a firmware update in April 2013, when the firmware was bumped up to V 1.2.1. When this camera was first launched, it did not provide AF at f/8. Canon 500mm f/4 L IS II + 2X Extender -> f/8.If you are a bit rusty on your f-stops, then you can refer to my f-stop chart in order to count either 1 or 2 stops up the chart from where your lens is. For more information on extenders and the math behind this increase, you can read my ultimate guide to extenders and teleconverters. Next, you need to know that a 1.4x extender will increase the maximum aperture by one stop, and a 2x extender will increase the max aperture by two stops. This will be written on the lens and in the specifications. To find out the maximum aperture of your lens+extender combination, you first need to know the lens’s maximum aperture in its native form. This last part has become a little more complex in recent years because some newer lenses now deliver such improved AF performance that they allow more AF points to be used at f/8 than some older lenses. The table in this guide will tell you whether any sort of AF is possible with your camera at f/8, but it will also try to provide up-to-date notes on which AF points work at f/8 and beyond. Some cameras will only allow the AF to work with a central AF point, and some will allow AF with the full gamut of AF points. Every year Canon is expanding the capabilities of its AF systems, and the result is that more and more DSLR cameras do feature AF at f/8 to varying degrees. Whether a DSLR camera will autofocus with an f/8 max aperture doesn’t tell the whole story these days. This includes using adapted EF lenses on a Canon RF mirrorless camera using the Canon EF to RF adapter. Though you will see slower and less accurate autofocus performance with lenses with a maximum aperture of f/8 or smaller, Canon RF cameras will still focus. Canon mirrorless cameras are not subject to the same f/8 autofocus limitations.
Tricking Cameras With 3rd Party ExtendersĬan Canon Mirrorless Cameras Autofocus at f/8?Ĭanon’s RF mirrorless cameras and RF lenses use a different autofocus system than their DSLR cameras.Can Canon Mirrorless Cameras Autofocus at f/8?.
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