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WAREGEM, 01-09-2019, Regenboogstadion. Jupiler Pro League 2019-2020. Speeldag 6. SV Zulte Waregem - Royal Antwerp F.C. 2-0.
The lens used is a zesis 55mm lens at f/2.0 So N=2.0and f=55 The camera shot this 600 mm from the subject at focus, so U=600. The circle of confusion of my camera is 0.03
Therefore, plugging the information into the formula gives me: (2CNU^2)/(f^2) =
(2(0.03)(2.0)(600)^2)/(55^2)
= 14.28mm is the expected DOF when ruler is horizontal.
However, the ruler is foreshortened, because it's at an angle of 45 degrees. 14.28mm of depth being in focus should mean a space of sqrt(2)*14.28 mm on the ruler looks sharp. sqrt(2)*14.28 = 20.20mm. Looking at the image, I would say it's in focus between the 4.5cm mark and the 6.5cm mark. That's 20mm, which is pretty close to the calculated value... Success!
siccome mi sono fatto crescere la barba ecco la nuova versione del mio avatar fatta con il southpark studio
la vecchia la trovate qui
Merley Cobham Sports 2-0 Westland Sports Dorset Premier League 24th February 2018 at Merley Cobham Sports Club