foto16 wrote: molson wrote: foto16 wrote:
I know the title exaggerates a bit, but I'm envious of Canon and Nikon users. Canon's focus guide shows when the focus is in front of or back to the subject, and a green box of focus confirmation appears when the focus is right on the subject. Nikon ZF recently also introduced the green box focus confirmation. But Sony only has peaking, and peaking is regarded as not accurate.
The Nikon and Canon focus assist features rely on exactly the same AF sensor measurements that are used for focus peaking - the accuracy is the same for all of them. The only difference is how the information is presented.
Regarding accuracy, are you speaking from your own experience using all three systems (because we hear different opinions)?
Sure they all use the same data, but "how the information is presented" makes a huge difference. To my understanding peaking and confirmation are not the same thing. When the green box lights up, it tells you the subject under the square is in focus per the algorithm's calculation and there is no user input in it, while the peaking highlights will appear within a range of MF positions and you have to eyeball at which MF position you think the contrast is the highest. This makes a difference in shooting speed and the required user input.
I believe peaking highlights the pixels that have maximized contrast or those that are „close enough“ to very high contrast. It is user adjustable how many pixel are included.
The box that lights up also relies on contrast detection as well but the threshhold at which the box lights up is not adjustable by the user (It is given by the manufacturer, at least as far as I am aware of, I may be corrected on this).
It would be interesting if someone could clarify if the box relies on phase detection, then it would truely be a different mechanism, but I am not aware that it is. To my knowledge phase detection requires distance encoding by the lens and Voigtländer lenses do not offer this for Canon and Nikon (and many other manual focus lenses don‘t either)
Oct 22, 2024 at 12:31 PM
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