![]() ![]() Since the scale shows both metric and English distances at different points along the scale, the first step I would take if needing to be so precise is to convert each metric measurement to English, and vice-versa, and add them to a screenshot of the scale using something like Paint if you're using Windows or whatever the Mac equivalent is if you're using a Mac. ![]() (But then that breaks down when using the metric markings! Argh.) The 4 is about three-quarters of the way between the 3 and the 5. In the middle of the matrix, the "halfway distance" is increased to about three-quarters of the way along the scale. The 3 sits about two-thirds of the way between the 2 and the 4. Look at the position of 2, 3, and 4 feet, for example. It would probably be close enough to use a rule of thumb that the halfway point in focus distance between two adjacent numbers on the left third of the matrix is two-thirds of the way between those numbers on the scale. You need to take that into account, rather than assuming the distance between each set of adjacent numbers is linear. ![]()
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January 2023
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