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With a simple lens, when you turn the focus ring you are moving the whole lens closer or further away from the sensor. Much like you would focus the sun to a spot of light using a magnifying glass. The sun is effectively infinitely far away. A simple 50mm lens would be 50mm from the sensor when focussed on the sun (not normally true for camera lenses due to ...


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When you change lens focus it does not affect the DOField. That is simply a factor of aperture and magnification. Lens magnification (focal length) determines how large a point will be when it reaches the sensor. Subject distance determines how large that point is initially (i.e. larger if closer), and therefore affects the magnified result. It is not ...


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Think about a tiny portion of a vista, maybe the gleam in a pretty girl’s eye. If this object is a far distance, the light from this tiny object arrives at the lens as parallel rays. The shape of the glass lenses and their density alters the path of this incoming light. It departs the lens as converting rays. A trace of these rays resembles a cone of light. ...


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It's hard to tell without more information & EXIF data. Here are some possible explanations (and why more info is helpful) If using "One Shot" focus mode, if a subject (or camera) moves after the camera locks focus then it will not re-focus. AF point review will indicate which AF was used to lock focus, but it is an indication of which AF point was ...


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Both images appear to be front-focused. The rocks in front of the dog look like they are sharper than the dog. This might be an issue that could be solved using AFMA, or it might be a problem where you think you are telling the camera to focus on one thing when you are really telling the camera to focus where it thinks best. Since you haven't told us what ...


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You are using the contrast based AF system and it is quite different from the phase based AF system used otherwise. It appears you simply do not understand it or have it set up appropriately. There is no AF-C when in live View. There is AF-F with a few options. And when AF-F is used autofocus is continuous until you press the shutter button or AF-on button....


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Many camera lens lash-up have a mechanical stop that prevents the lens from racking forward beyond a certain distance. This sets the minimum focus distance to about 2 feet (600mm). General purpose camera lenses are optimized for nearby and far subject distances and slightly compromised when tasked to work close-in. Additionally, the f-numbers engraved on ...


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Minimum focus distance means minimum focus distance of the lens (unless additional accessories are added). Lenses focus at only ONE precise distance, period. Depth of Field adds to that (plus and minus, as an acceptable zone) only providing an approximate "good enough" sharpness zone as defined by CoC (Circle of Confusion). Depth of Field numbers of say 2 ...


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Get s few paralel lines (at least 5) with equal distance between them printed on a sheet of paper. You can also find test grid photos online. [edit] Try for example 7 lines with 1cm between each 2 of them. Thickness of lines ..let's say 2mm would work great. You can also use a simple ruler. Position the paper and the camera so you see through the ...


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