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Anonymous
>>150318
monti here:
I'm afraid that's a myth - saying that "focal length is irrelevant in DOF" because To use telephoto, you have to back up (which increases DOF). *To get close, you have to use wide-angle (which increases DOF). *They cancel each other out. Well actually *No they don't. *I mean, yes, technically they do, but just try it, look at your shots and you'll see, the telephoto shot clearly, clearly looks like the background is more out of focus. *Whether it's technically as "in-focus" or not is irrelevant, the telephoto lens delivers the optical illusion that the background is more out of focus, and that's what we want: the APPEARANCE that the background is out of focus.
DOF is influenced by three factors: closeness to subject, focal length of lens, and aperture setting.
Basically this is how it breaks down..:
SHALLOWER DOF -------------- DEEPER DOF Close to subject -------------- Far away from subject Telephoto Lens --------------- Wide-Angle Lens Open Aperture ---------------- Smaller aperture
Also it helps to have a good distance between the subject and the background, examples being large streets, open fields, etc. The further they are from the background, the more the background will be out of focus.
Pretty much the most important thing will be keeping that iris open as much as possible - and if it blows out your picture, put on some ND filters (if you still want motion blur) or just bump up that shutter speed.
thanks guys monti
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