Napioa - Wind Origins

Napioa - Wind Origins
by octopus                

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2

Remove the supplemental lens from the phone-camera. On a sunny day, hold the lens between a white sheet of paper and the sun. The lens will project a tiny image of the sun on the paper. You start with the lens touching the paper and slowly increase lens to paper distance. When the image of sun is a tiny spot of light, the distance lens to paper is measured ...


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Focal length is the distance between the focus point on the lens and the plane of the image sensor. For example a 50mm lens set to focus at 10 ft has 50 mm between if's focus point and the sensor and 10 ft from focus point to subject.


0

There are two "magnifications" which are related to addon lenses: the maximum magnification achievable in combination with a given camera and relative (optical) magnification. To know maximum magnification (ratio between object size and image size at focal plane) you need to photograph a ruler parralel to the frame as close as possible and then divide the ...



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