If perhaps a compact, your picture may have used one of those end point focal lengths, or used another intermediate one, like 10 mm focal length, and that's the number that the scene description wants (to compute the picture). It won't work from a cropped image or a paper print. It's just simple math, so if your results don't seem reasonable, verify your inputs (including sensor size, focal length, scene distance and dimensions, and the big difference between focal length and Equivalent focal length). The Field of View is what is equivalent on the two cameras. Otherwise, the dimensional units outside the lens specify feet or meters, and are suggested, but you can use any external units (including miles or km or cubits, etc). There is a tripod-mounting socket on the base. You specify if you are measuring width or height direction, and also how the camera is rotated to determine which dimension is that width or height. Feb 5, 2018 - I’ve admired Johannes Vermeer’s (1632-75) paintings for some time. JavaScript seems to be disabled in your browser. So when it has already computed once, clicking Compute again (or selecting another computing goal) without change can only compute the same matches, with no visible change then, until you change something. But for still images, the image Exif data normally shows lens focal length, for compacts and cell phones too (and is likely about all you will ever know about the cell phone lens). I happen to like PinholeCalc from Concept House. This door measures 80 inches tall, or 6.67 feet (the size of some things might be reasonably estimated, which then won't be a precise number). Do not expect camera results to normally be this accurate. But if the goal is otherwise, this math part couldn't be easier. In the original full size image, the cropped door is 2724 pixels tall (crop it, then look at cropped image size). Once the inputs are in place, the Exposure Information is listed on the right at the bottom. Check that the coverage circle is large enough to cover the negative This chart of angles can be a foreshortening guide, which is the angle of the camera (0 degrees is level). It should be as you would expect, but to be very clear, the orientation and use of the sensor dimensions will be shown, so you can verify it is specified correctly. If both the sensor plane and the object are vertical, then these are parallel at any object position, so there is no tilting (no walls falling backwards), but larger angles can still cause foreshortening of vertical dimensions. Most compact cameras, for example, if the lens specification for your compact is 4.3 mm, and it is said to match the field of view with an Equivalent 35 mm film camera using the 24 mm lens, these are the numbers it wants (the Equivalent 24, and Your Lens 4.3 mm) from your lens specification, as shown in the examples. Since this lens does not zoom, then it’s the one actual real focal length used. But that Equivalent focal length is Not even about your camera, it is simply a comparison to another lens that is instead used on another hypothetical 35 mm film camera (for it to then see the same Field of View that your camera sees). Or if the camera is aimed up or down (plus or minus angles) is the same effect. But that is speaking of Optical zoom performed by the lens. There are issues when trying to determine the sensor size of compact or phone cameras. You can unsubscribe at any time. The OBSCURA kit comes with, the OBSCURA camera, a simple exposure calculator for use without a light meter, a set of stickers, a user instruction booklet and a 3-tray light-tight sheet film box for storing exposed materials.

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