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Depth of Field is computed from focal length, aperture, focus distance, and also sensor size. The distance limit of the depth of field is where the blur circle diameter is computed to exceed the maximum acceptable Circle of Confusion, which is computed from sensor diagonal size. With all other factors equal: A shorter focal length has greater depth of ...


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I'm going to chime in with a far less precise response (credit to the previous responders). You asked which setup would provide "more" bokeh. As I'm sure you know, bokeh in all its facets - the 'amount', the shape of the background objects (circular, angular etc) - is one of the most subject aspects of photography. It is so much more than blur. That ...


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The Sigma 56mm f/1.4 would have the most background blur of the three, but the Sigma 30mm f/1.4 is very close because you need to move much closer for the same framing. The Minolta 50mm f/1.8 will have more depth of field, and not as much background blur as the other two. The type of lens or "native" mount does not matter. All that matters is the camera ...


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Many lower-cost (or even more expensive but high zoom-ratio) lenses do not have a constant maximum aperture. They are constructed so that they have as wide as possible aperture when zoomed out, but the design compromises in their construction mean they are limited to narrower apertures when zoomed in. I expect that's what's happening here: you have an ...


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