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Depth of Field and Aperture

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trevor grout

on 17 August 2013

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Transcript of Depth of Field and Aperture

Depth of Field Defn: the range of distances of the object in front of an image-forming device (as a camera lens) measured along the axis of the device throughout which the image has acceptable sharpness
--Webster Dictionary Huh?? For Example Depth of Field! Courtesy: Google Images Courtesy: Google Images How to control depth of field Aperture Focal Length Depth of field is desired because
it gives enormous creative control
allows you to decide what the focus of the picture is Focal Length As focal length increases, it yields shorter depths of field for a given aperture 300 mm @ f/8 Aperture Broader Picture Exposure Triangle
-Bryan Peterson ISO Shutter Speed Aperture Capture the light! What is Aperture? Eye of Camera Courtesy: Google Images Courtesy: Google Images When it is bright your pupil restricts light When it is dark your pupil lets in more light Courtesy: Google Images Courtesy: Google Images Instead of your eye it is the camera lens Courtesy: Google Images Aperture ranges from f/1.8 to f/22 or more What's up with the numbers? Courtesy: Google Images Aperture values are fractions just like measuring cups 1/2 cup > 1/3 cup
f/2.8 > f/8.0 Courtesy: Google Images Small Aperture Large Aperture Aperture and Depth of Field Aperture controls depth of field

Large aperture = shallow depth of field
Small aperture = deep depth of field Let's compare Large Aperture (f/2.0) Small Aperture (f/11) f/2.8 f/11 Creatively Using Aperture Use the "creatively correct" aperture
-Bryan Peterson Shallow depth of field (large aperture) pictures are "me" pictures. One thing/person is the center of our attention! "me" shots Deep depth of field (small apertures) yields "storytelling" pictures Review Depth of field is an important component to photography

Depth of field can be controlled by
Focal length
Distance to subject Aperture is part of the exposure triangle
Aperture affects the depth of field
Large aperture means shallow depth of field
Small aperture means deep depth of field The "I don't care apertures" (pick one) are when you are shooting against a flat background and want to maximize sharpness. Which aperture to shoot?
The "creatively correct" one!

For attention shots (larger aperture)
For "storytelling" shots (small aperture)
For everything else (pick one) References

Bryan Peterson, 2010. Understanding Exposure. Amphoto Books. ISBN: 978-0-8174-3939-2(pbk). 176 pages.

Google Images 40mm @ f/2.8 40mm @ f/3.5 40mm @ f/2.8 40mm @ f/4.0 40mm @ f/8 40mm @ f/11 40mm @ f/9.5 40mm @ f/9.5 40mm @ f/4.5 40mm @ f/2.8 Distance 40mm @ f/16 40mm @ f/22 Distance The distance of the camera affects depth of field

The closer to your subject, the shallower the depth of field

The further away from your subject the deeper the depth of field For example, consider these two pictures shot at the same aperture but different distances 50mm @ f2; distance = 4ft 50mm @ f/2; distance = 1.5ft depth of field ~ 2 inches depth of field ~ 6 inches What to do if my lens doesn't have large aperture? you can
separate background from your subject
use lowest aperture you can Questions?
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