While using manual focus for a long time, when autofocus cameras were rare and also now when switching to manual focusing, I use zone focusing, the easiest way of focusing, calculating the distance in the mind and setting the lens to that distance. It is easy in wide angles say from 28mm to 50mm of a zoom lens and small apertures.2. Assume that you are photographing an event, which occurs within a set area such as football match, children coming out of school in a rush and hurry. By choosing the correct aperture for the lens, it will be possible for you to obtain acceptably sharp/sharp pictures from a subject anywhere within that area without having to alter the focus again. For example my subject comes within the area of 10ft to 30ft and moves within that area...My DOF table on the lens will give an aperture of f8, since the DOF stretches from 10ft and even beyond to 30ft at f8, and the subject shot at 15ft or 20ft will be sharp within the said DOF...Thus if the boys are rushing out of school...i focus my lens at 15ft and to find the best action boy/girl at that distance, i immediately click the shutter.....next example: if a procession is on the move, i move to front and a little bit more of distance and when the appropriate subject comes within 10ft,15ft,20ft, i focus at any of that distance without looking in the viewfinder and click fast. The picture will be sharp with sufficient dof, including more people in sharp focus from front to back.
3. In the picture above the saluting boy was 10ft. I focused at 10ft on my 28-200 sigma lens and since it was sunlight, i used ISO100, f11 at 1/250 and clicked the guy correctly focused. Only i cared for focusing when i took my lens from 70 to 200mm.
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