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Jun 29, 2014, 12:43 AM
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Focal length calculator



A tool that everyone alive & especially aerial shooters could use is a way to plan shots based on focal length & satellite photos. There are probably many tools around, somewhere. A quick review of the Goog store didn't reveal any, so threw together some more Javascript.

http://heroinewarrior.com/focus.html

While it's nowhere close to a comprehensive solution, it does the absolute minimum of superimposing field of view for a given focal length on a satellite photo. No more packing anything but the exact lens you need.


It's hard coded for a 35mm DSLR of a certain crop factor, horizontally mounted. The next step would be either a vertical mount option or direct entry of the sensor width. Height of the field of view can't be easily conveyed. The oblique satellite photo gives a rough estimation of the height of an object, relative to the field of view. A street view overlay could be more useful, but their imagery is limited to just public roads.

Field of view gets less accurate as the lens gets wider. It probably doesn't represent a fisheye lens at all.
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