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Focus peaking v. magnification

Started May 4, 2014 | Discussions thread
MOD Tom Caldwell Forum Pro • Posts: 46,357
Re: Focus peaking v. magnification

iansmith wrote:

Tom Caldwell wrote:

Way to go, I think if focus peaking is not working for you then you have not yet learned how to read it properly. It uses the same contrast detect information that AF lenses might use and we don't get complaints much that AF lenses are not getting correct focus. Of course AF on lenses is directed at certain points in the screen whilst focus peaking checks and highlights the whole area in focus to the point of actual depth of field.

I've noticed the effect posted by Sean Nelson above, and focus peaking is very much NOT the same system as contrast detection.

It only is 100% accurate when you magnify the live image, otherwise it is just showing you contrast on the LCD display which is not accurate.

It's still a good tool, but you are right it needs to be used properly.

Focus peaking on low resolution screens does not work so well that is why many companies were slow to adopt it. The higher the resolution screen the better it gets.  On the Pentax Q it is only a very dotty twinkle but once you know what to expect and how to interpret it somehow magically becomes more accurate. But on the low-res Q screen 2x magnification is about as far as the screen resolution will take it.

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Tom Caldwell

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