Lightnings taking a ride

by ceinmart

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1

Wikipedia has all of the DoF formulae you probably ever need. You may now begin to see why optics is a field of physics unto itself. You aren't going to be able to learn these equations and do them in your head to map an ƒ number to a depth of field in, say, feet. This is why there are so many DoF calculators floating around. I wrote one of many.


1

The math on two fstops is the square root of the sum of the two squares, but I don't know about EV. If the lights were equal, and if they lighted the same overlapping area, twice the light is one stop additional. But you say the ambient is 3 stops down from the lamp, so it won't have much effect. This ambient adds less than 0.2 stop increase, not over ...


2

It is really rather simple. The diopter value will tell you how close you must be to the subject of your photograph, the farthest distance you can get a sharp image with the close-up lens on. you divide one metre by the diopter value to get the distance, which is the focal distance of the close-up lens. Hence a +1 lens will give a far distance of 1 m and ...



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