Lenses come in two flavors: prime lenses, which have a single fixed focal…length, that means they have one field of view, and zoom lenses which have a…variable focal length.…So they have a field of view that can go from wide to more narrow.…For the most part a lens with a longer focal length will be physically longer. For example,…I've got this 400mm lens, which is as you would expect much longer than this 50mm lens.…Now I say for the most part, because zoom lenses can complicate things.…For example, I've got this 50mm lens here and then I've got this is a 16 to…35 millimeter zoom.…
It's much longer than the 50. That's because zoom lenses have complex mechanics…and sometimes require extra glass.…So even though this is ultimately a shorter focal length, it's a…physically longer lens.…With primes you'll sometimes find a kind of odd size variation.…For example, here is a 28mm lens and here is a different 50mm lens. The 28mm is…a shorter focal length, but in this case it's a physically larger lens.…
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
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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: Primes and zooms