Thinking about jumping ship due to poor AF. Any help?

Started Apr 28, 2014 | Discussions thread
awaldram Forum Pro • Posts: 13,133
Re: Thinking about jumping ship due to poor AF. Any help?

GabrielFFontes wrote:

Hello Timo.

I'll be posting soon some examples of focusing problems i've had. They're usually really random, as in, the camera really does not like focusing on some specific things, even though they don't have a repetitive pattern nor suffer from low contrast.

Thank you.

Unless your in live view 'contrast' is irrelevant.

Phase detect works by overlaying two images sampled from two points (the baseline) the sensor can use the position and separation of these two images to work out how much to refocus the lens, and in which direction.

f2.8 sensors ala k5ii and k3 have points so far apart you must use an F2.8 lens or faster to hit both at the same time, But this gives an increased accuracy for these faster lens.

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