Question by peapiejr: What two controls regulate acceptable depth of field ?
What is acceptable depth of field ?
Thank all of you for your answers . I am taking a class we do not have wriitten homework. Or written test. So, I wasn’t asking anyone to do my homework. I read this over and over and was not sure I understood it
Best answer:
Answer by cliff_occo
Speed and aperture combined. What is acceptable depends entirely on the picture being taken and the result the photographer wants to achieve. There can be no rule.
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This seems like another homework question, but here goes.
Firstly speed has nothing to do with depth of field. Speed may assist in determining how much of a shot will be sharp, but this is only because of camera/subject movement.
To be anally technical, there is no such thing as depth of field. Depending where the focal distance is set, there is one set distance from the focal plane of the camera which is the point of focus, everything in front of and behind that point will be progressively more blurry. However in the real world due to limitations of cameras, reproductive equipment and to some extent our eyes, some of the area behind and in front of the focus point will appear to be acceptably sharp. How acceptable and how sharp is a discussion of the “circle of confusion” which is how small a circle can be before we see it as simply a dot. (But a wise Dr Sam once advised me “let’s not even go there”)
Now how large or small this distance of acceptable sharpness (referred to as ‘depth of field’) appears is controlled by the lens aperture. A small tight aperture (high ‘f’ number) will produce a large depth of field and conversely a large wide aperture (low ‘f’ number) will produce a much shallower depth of field. To make matters even more complicated the focal length of a lens also plays a part. For example there is more depth of field on a 10mm lens at f8 than there is on a 100mm lens at f8.
For an even more detailed understanding try researching hyperfocal distance using the link below. They may explain things better than I did.
teef_au
http://www.dofmaster.com/dofjs.html
ou do the reading!
It depends upon the length of the grass, the height of the trees and the number of cows in the field. If you can control those things you should be able to regulate the depth of the field (as opposed to the width of the field). Unless.. it is raining, in which case you should give up and go to McDonald’s instead, where you can study your text books and do your homework instead of getting other people to do it for you.