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EXCERPT page containing first few paragraphs. 2017-04-25 03:30:42

Autofocus Inconsistency, Backfocus, Manual Focus

Like many mirrorless cameras, the Leica X Vario has a fundamental algorithmic flaw in its autofocus: it focuses with the lens stopped down to the shooting aperture. Compare that idea with opening the lens diaphragm to focus precisely, then shooting at the stopped-down aperture (as with all DSLR cameras).

This stopped-down autofocus algorithm not only affects focus accuracy, it actively degrades autofocus performance as the lighting dims, a problem I encountered repeatedly in the field. At times, the focus was unable to lock on at all unless I opened the aperture fully.

With the lens stopped down, a deeper zone of sharp focus is obtained (depth of field), and the camera cannot then distinguish the optimal focus, with the result that the near-far positioning of the zone of focus can be skewed in undesirable ways: a blurry foreground and too-sharp background or vice versa—all while the chosen point of focus is just as sharp either way (or maybe not, as we shall see).

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Since 2009, Diglloyd Guide to Mirrorless covers mirrorless cameras and lenses. Includes interchangeable lens camera systems (Sony, Fujifilm, Olympus, etc) as well as fixed-lens cameras (Sony, Sigma, Ricoh, etc).

In addition to the manufacturer-brand lenses, lens coverage includes 3rd-party lens lines like Zeiss Touit, Zeiss Loxia and Zeiss Batis.

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