BetterPhoto Member |
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35mm (film) aperature settings
Will you tell me if this is correct?
To obtain a long depth of field where everything from foreground to background appears to be in focus - I need a small aperature? To obtain a narrow depth of field - I need a large aperature? To obtain a blurred motion I need a slow shutter speed with a high aperature? To obtain a stopped action - I need a high shutter speed with a low aperature? This is basically 4 questions. Thanks so much! Rose Howland
February 05, 2007
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Samuel Smith |
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welcome rose,
evrything will not be in focus.kinda but no.what lens?but with most it starts at 5 or 6 feet and beyond.f22.
f2.8 andf4, yeah very narrow dof.
blurred motion is the understanding of your camera,plus iso,shutter speed and aperture.
stopped action-speed of the lens,iso,aperture and can you handhold or not,then the shutter speed you select will make a difference.
sam
February 05, 2007
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Alan N. Marcus |
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Hi Rose, You got it right! Congratulations: Just a few fine points: To obtain a long depth of field where everything from foreground to background appears to be in focus - I need a small aperture? Right on –- It’s the tiny lens opening that does the trick that’s f/22 and f/16. These small apertures broaden the depth-of-field span. These larger f/numbers translate into very tiny lens openings.
To obtain a narrow depth of field - I need a large aperture?
Right again – Large aperture (wide lens openings) like f/4 or f/2 reduce the span of acceptable focus thus depth-of-field becomes shallow.
To obtain a blurred motion I need a slow shutter speed with a high aperture?
Right – However, its slow shutter speed that gives rise to blurred motion. The aperture is not a contributor. Using a slow shutter speed allows the exposing light to play of the film or the digital chip for an extended duration. This increased dwell time often results in over-exposure. We often must counter by using a tiny lens openings like f/16 or f/22.
To obtain a stopped action - I need a high shutter speed with a low aperture?
Right in principle, a high shutter speed is a quick blink that reduces the time allowed for the exposing light to register on the film or digital chip. Its the fast action that arrests motion. Because a fast shutter reduces the time the exposing light is allowed to play of the film or chip, under exposure is a danger. Therefore we often need to compensate by using a wide lens opening like f/5.6 or f/4 or even f/2 etc.
Good for you Rose!
Alan Marcus
ammarcus@earthlink.net
February 05, 2007
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