EXCERPT page containing first few paragraphs. 2017-04-30 11:48:38
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This series assesses the Fujifilm GF 63mm f/2.8 at relatively close range on a subject whose key details are in the central half of the frame.
Prelude with regards to optimal focus:
The precision of a measurement system, related to reproducibility and repeatability, is the degree to which repeated measurements under unchanged conditions show the same results. A measurement system can be accurate but not precise, precise but not accurate, neither, or both. High precision is what matters for digital cameras—very low variability—since that allows for focus adjustments.
Focusing protocol = refocusing for each aperture as per my focusing protocol discussion.
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These systems are hugely expensive, so make the right choice for your own needs (full frame vs medium format).
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