A quick and technical question about autofocus.

Started 3 months ago | Questions thread
PicPocket Veteran Member • Posts: 4,111
Re: A quick and technical question about autofocus.

The Ambassador wrote:

Ok, thank you!
So, even in mirrorless systems it makes sense to talk about low light focus performance (because of the lens). And not about the front/back focus.

In addition, lenses have their own accuracy and speed aspects too. Even though the sensor can measure how much adjustment is needed to bring the image into focus, it still needs to relay it to lens and expect the lens mechanisms to move the Optics in place. How fast and accurately a given lens can do this, how much tolerance does it have to consider the job done perfectly and how well can it relay back the information to the camera all plays a part it your overall AF experience. This is why lenses can still hunt, miss focus occasionally or need firmware updates to make things work (specially 3rd party lenses)

So front/back focusing due to separate AF sensor is just one improvement in a coherent system. Mirrorless eliminates one point of failure, but you are still dependent on body, lens and how well they can coordinate with each other

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