# Tag Info

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Avoiding calculations can be done with image editing software. If you take software such as Photoshop Elements and select the cropping tool, you will see some number entry boxes along the menu bar at the top of the image frame. Enter the dimensions you want in the width and height boxes and 300 in the pixels per inch box. Crop the image using the crop tool, ...

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There are three basic principles here: You want at least 200 pixels per inch in your print. For most subjects, most people will start to see pixelated blockiness if you have less than that. 300 pixels per inch would be better, and that's especially true for a small print like this, because people are more likely to examine it very closely. For large prints ...

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It's easy: you take the desired DPI (dots per inch) and multiply it with the frame size. Say, your photolab (or printer) prints with 300 dpi. Then your picture must be at least 2.5*300 x 3.5*300 = 750x1050 pixels. However I doubt that you have such a low resolution in your Nikon :) I recommend to take photos with maximal available resolution. So you will ...

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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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The crop factor does not affect the aperture. The aperture is given by the phisical construction of the lens. The focal length and the pupil. f = focal length D = Diameter of the pupil Fnumber(N) = f/D No other variable is there. If you phisically affect the focal length, for example using a teleconverter then you do need to make adjustments to the ...

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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.

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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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Well yes, your effective field of view is the same as the FOV with an 896mm focal length lens on a 35mm sensor. However, a smaller sensor has a different magnification compared to a FF sensor at any given focal length - it doesn't crop an APS-C lens, but magnifies the focal length differently than a 35mm sensors does. The higher pixel pitch of most smaller ...

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Yes, placing a teleconverter on a crop works exactly the same as on a full frame – you multiply the teleconversion factor by the lens focal length, and since it's on a crop, you factor in the 1.6x crop factor of a Canon APS-c to get an effective focal length of 896. Keep in mind that placing extenders on any lens will decrease its effective aperture. For ...

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Well, the main thing is that crop factor doesn't really affect focal length. It just affects the field of view by making it narrower. So, what you really have is a 400x1.4x => 560mm lens combination on a crop body, which has the same FoV that an 896mm lens would have on a full frame body. So, unless you shoot full frame enough to translate focal lengths to ...

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Yes many people do exactly what you suggest and end up with a field of view that is equivelent to an 896mm lens on a full frame camera.

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