DoF marks and the M8

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This subject was analyzed in this forum before, but a summary could be interesting.

 

I will try to adapt the findings of Bob Atkins in this article:

 

http://www.bobatkins.com/photography/technical/digitaldof.html

 

 

Atkins calculates the hiperfocal distance in a APS-C camera by multiplying the original hyperfocal distance by the crop factor.

 

For instance, at f/16 the hyperfocal distance is 0.7 [the formulation is H = L^2 / (f * CoC), where L is the focal lengh, f is the aperture and CoC is the circle of confusion] for the 35mm format. Then, for a APS-C camera H becomes 0.625*1.6 = 1.

 

The M8's crop factor is 1.33. In that case we have 0.7*1.33 = 0.93. This is like using f/11 for focusing instead of f/16. One step less, LCT's rule of dumb.

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