hyperfocal distance वाक्य
उदाहरण वाक्य
मोबाइल
- For example, with the 35 mm lens shown above set to f / 11, aligning the infinity mark with the'11'to the left of the index mark on the DOF scale would set the focus to the hyperfocal distance.
- When the subject is at the hyperfocal distance or beyond, the far DOF is infinite, so the ratio is 1 : "; as the subject distance decreases, near : far DOF ratio increases, approaching unity at high magnification.
- The oft-cited rule that 1 / 3 of the DOF is in front of the subject and 2 / 3 is beyond ( a 1 : 2 ratio ) is true only when the subject distance is 1 / 3 the hyperfocal distance.
- The concepts of the two definitions of hyperfocal distance have a long history, tied up with the terminology for depth of field, depth of focus, circle of confusion, etc . Here are some selected early quotations and interpretations on the topic.
- The " hyperfocal distance " technique makes as much as possible " acceptably " sharp so that the photographer is freed up even further, from not having to consider the subject's distance, other than not being too close.
- :: Nothing like that has an unlimited depth of field, as far as I know, but if everything you are interested in is beyond the hyperfocal distance then you can just keep the sight focused at infinity and everything will be in focus.
- Their focal range is about 1000 times their aperture diameter, so it makes sense as a hyperfocal distance with CoC value of " f " / 1000, or image format diagonal times 1 / 1000 assuming the lens is a normal lens.
- The hyperfocal distance is the nearest focus distance at which the DOF extends to infinity; focusing the camera at the hyperfocal distance results in the largest possible depth of field for a given f-number ( Object field methods above for a rationale for doing so.
- The hyperfocal distance is the nearest focus distance at which the DOF extends to infinity; focusing the camera at the hyperfocal distance results in the largest possible depth of field for a given f-number ( Object field methods above for a rationale for doing so.
- For example, on the Minox LX focusing dial there is a red dot between 2 m and infinity; when the lens is set at the red dot, that is, focused at the hyperfocal distance, the depth of field stretches from 2 m to infinity.
- This ratio is approximate, and breaks down in the macro range of the larger format ( the value of m in the numerator is no longer negligible ) or as distance approaches the hyperfocal distance for the smaller format ( the DOF of the smaller format approaches infinity ).
- But he does not invert this to find the " S " corresponding to a given " c " criterion ( i . e . he does not solve for the hyperfocal distance ), nor does he consider focusing at any other distance than infinity.
- The "'Depssi "'card ( Depth of field, sunrise, sunset indicator ) is a handy guide / reference card that has two functions; it enables the outdoor photographer to quickly select the hyperfocal distance for different lenses ( or zoom settings ) using various apertures.
- Fixed-focus lenses are unable to produce sharp close-ups, or images of objects that are only a fraction of the hyperfocal distance from the camera which, depending on factors including the size of the camera, may be within 2.4 3.7 meters ( 8 12 feet ).
- Two commonly used alternative focusing techniques are zone focusing and hyperfocal distance, either to free the photographer from manual-focus; or where autofocus is too slow, or the photographer cannot be sure the focus point will fall where the photographer chooses to place their subject in a quickly changing situation; and which also facilitate shooting " from the hip " i . e . without bringing the camera up to the eye.
- I'm not sure what the hyperfocal distance for a typical telescopic sight is, but since 1 ) the sights are very small, 2 ) the distances involved are very large ( otherwise you wouldn't bother with a telescopic sight ) and 3 ) the acceptable amount of blur is quite high ( you don't need to be able to see the object clearly, you just need to be able to see where it is in order to aim at it ), it wouldn't surprise me at all if focusing at infinity worked fine the vast majority of the time .-- talk ) 18 : 40, 5 March 2011 ( UTC)
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