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normally, the digi cams have a lens of focal length 16mm. The hyper focal length starts at 2 meters away from the camera, as a thumb rule

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normally, the digi cams have a lens of focal length 16mm. The hyper focal length starts at 2 meters away from the camera, as a thumb rule

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I have listed what I know in no particular order of preference, and any of them could be used alone or in combination. What's best depends on your situation.

1) use a smaller aperture

2) move back from the main subject

3) use a shorter focal length lens

4) focus on the hyperfocal distance

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It is a technique that maximizes the depth of field by rendering more of the foreground in focus than would ordinarily be achieved when the lens is set to focus on infinity (when the focus is turned to the maximum distance). Consider that depth of field is defined as the distance from a foreground point to a background point that is rendered as acceptably sharp (it cannot truly be a distance "in focus" as some would say since it is only possible to focus on one plane). If you really understand depth of field scales on the lens barrel, you should be able to comprehend that it should be possible to have the far point fall just on infinity rather than seemingly extend beyond it.

Hyperfocal distance is achieved by lining up the centre of the infinity mark on the focus scale with the indicator line for the apeture being used for the shot (the one at the far distance end of the aperture scale, not the near distance end of the scale). The foreground point of acceptable focus is then estimated by observing the reading on the distance scale that lines up with the other aperture indicator line I just referred to. Of course, when you look through the view finder, neither the near point or infinity will appear to be acceptably sharp if you are viewing at full aperture. The effect can only be pre-viewed if your camera can stop down the lens to the f-stop being used for the shot without taking the shot. Naturally, this effect is not worth the effort unless you are going to take the shot F11 or F16 or an equivalent for the film format you're using.

Micron

A rule of thumb is to think that if you focus on the hyperfocal distance you will be in focus from half the hyperfocal distance to infinity. Few zoom lenses have depth of field scales (the Tamron 80-200 is one), so you would have to rely on depth of field charts.

I used it many times with fixed focal length wide angle lens on a roll film Mamiya 120 slr. I set the infinity mark in the f22 position on the lens and found I had a depth of field that stretched from two feet to infinity!

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the distance is 0

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Distance = sqrt [(Y2 - Y1)2 + (X2 - X1)2]

Distance = sqrt [(6 - 4)2 + (- 4 - 0)2]

Distance = sqrt [(2)2 + (- 4)2]

Distance = sqrt(4 + 16)

Distance = sqrt(20)

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