That notebook is 148mm! Meh - Hits a hit I digress. I'da been happy hitting my 1m x 1m rubber board target I've been carting about lately.
I use Autocad to cheat all the time. It saves measuring up an elevation of a building if you take one measurement and then scale the photo in cad. As long as things are on the same focal plane (all you old guys who did tech drawing will know what I'm yapping on about). I just draw a line over the photo (say 148mm) and then use scale 'Scale' and the nested "reference" halfway through it.
https://play.google.com/store/apps/d...gns.targetCalc That's another program you can put on your phone that does scaling. Initially thought you had to have a 1inch square in the pic but you dont. Can be any known measurement
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