 We need a plan view of one lens, like shown above. (Here a pencil has been laid under the other/right lens, to lift it, to be able to take a plan view of the left lens).  The foto above shows how a pencil has been laid under the right lens, so the left one lays on the surface as flat as possible. Here you find gridpaper for you to print out. (If you use your own gridpaper, please indicate, if the lines are not seperated by cm/mm-distances). |
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How to take foto with gridpaper in the background |