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Old 6th May 2019
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Ross the fiddler Ross the fiddler is offline
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Re: Mk III small focus point?

Originally Posted by MikeOxon View Post
All this raises in my mind the question as to what actually happens when one selects a smaller area rectangle.

As I understand it, there are 121 focus points, which, I assume, are special points on the sensor array that are capable of detecting phase information. So, if the 'standard size' rectangle relates to one sensor, how does reducing the size of the rectangle on the screen make any difference? What am I missing??
On a non-PD-AF model such as an E-M10 III it should make no difference where or how big it is, just that there is enough discernible contrasting detail in the focus area.
I fiddle with violins (when I'm not fiddling with a camera).
Cameras: OM-D E-M1 & Mk II, Olympus Stylus 1, OM-D E-M5.
Lenses: M.ZD7-14mm f2.8 PRO Lens, M.ZD12-40mm f2.8 PRO Lens, M.ZD40-150mm f2.8 PRO Lens, MC-14, MC-20, M.ZD45mm f1.8, M.ZD12-50, M.ZD60 Macro, M.ZD75-300 Mk II, MMF-3, ZD14-54 II, Sigma 150mm F2.8 APO Macro DG HSM.
Flashes: FL36R X2, FL50R, FL50.
Software: Capture One Pro 10 (& Olympus Viewer 3).
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