To capture a really deep depth of field you use a smaller aperture, bigger-up number. …This should be basic exposure theory that you're already comfortable…with as well as an understanding that where you focus when you're trying to…shoot deep depth of field matters. We covered this earlier.…I want to talk to you now about how after a point closing your aperture down…might actually soften your image a little bit due to an optical phenomena…and called diffraction.…Basically it works like this. As you close the aperture down to a smaller hole,…when the light gets squeezed through that hole, it gets diffractive, knocked…around a little bit, and it ends up getting softened.…
It doesn't focus as sharply as it should.…Now, what we're about to demonstrate and show is a pretty finicky level of sharpness.…Sharpness is a very subjective thing.…Opticians typically refer to it as acceptable sharpness, meaning everyone has…a different idea of what's sharp and what's not.…Sharpness and how much it matters also depends on how you're outputting.…
Author
Released
2/11/2011- Understanding field of view and camera position
- Depth of field and lens choice
- How to choose a lens
- Examining lens features
- Using specialized lenses such as fisheye and tilt/shift lenses
- Focusing techniques
- Using filters
- Camera maintenance
Skill Level Beginner
Duration
Views
Related Courses
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Photography Foundations: Composition
with Ben Long5h 29m Intermediate
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1. Introduction
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Welcome1m 19s
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Who is this course for?1m 34s
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Why does the lens matter?2m 36s
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Changing lenses3m 43s
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A word about camera brands1m 53s
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2. What Is a Lens?
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What is a lens?3m 51s
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Field of view2m 36s
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Focal length multipliers5m 42s
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Primes and zooms2m 2s
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3. Focal Length, Camera Position, and Composition
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Shooting wide7m 2s
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Shooting telephoto8m 9s
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Focal length applications1m 59s
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4. Depth of Field
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Depth of field (DOF)5m 3s
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DOF and sensor size1m 50s
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DOF and background size2m 5s
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5. Choosing a Lens
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Choosing a lens7m 11s
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Image quality4m 10s
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Lens features6m 42s
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Size and weight6m 29s
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Specialty lenses5m 9s
-
Where to buy2m 54s
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Lens caps1m 28s
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6. Advanced Autofocus
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Focus point selection5m 54s
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Center-point auto-focus3m 51s
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Servo focus3m 46s
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Filters5m 46s
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Auto-focus and live view5m 2s
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7. Conclusion
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Maintenance14m 40s
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Micro-focus adjustments1m 31s
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Goodbye59s
-
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Video: Deep DOF and diffraction artifacts