Why I'm sending back my X100S (autofocus)

Started Mar 27, 2013 | Discussions thread
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Re: Why I'm sending back my X100S (autofocus)
In reply to mr moonlight, Mar 27, 2013

I'm sure I read somewhere that with Contrast Detect AF systems unlike Phase Detect ones on SLR's, you should NOT focus on the boundary between subject and background e.g. strong vertical lines.

With a Phase Detect system this is what you would normally do for focus.  Because a Phase Detect system can measure distance, it knows what is in the foreground.

With a Contrast Detect system it doesn't measure distance so has no idea which is front or which is back, so can pick either.  So, you should ensure no background falls into your focus area if you want accurate focusing.

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