Join Ben Long for an in-depth discussion in this video Depth of field (DOF), part of Foundations of Photography: Lenses.
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You should already be comfortable with the concept of depth of field and…understand how aperture choice impacts the depth of field in an image.…If you're not, then go watch the Foundations of Photography: Exposure course or…at least the depth of field and aperture bits of it.…To shoot shallower depth of field, you need to use a wider aperture.…One that has a lower f-stop number.…So f/2.8 yields an image with less depth of field than f/11.…Now the thing is not all lenses can open their aperture all the way to f/2.8.…
For all sorts of complex physics and optical reasons, the lens has to be engineered…specifically to manage an aperture of a particular size.…This means that every lens has a maximum aperture size to which it can be opened…and that size is written on the front of the lens.…For example, here is a 50mm lens that has a maximum aperture of f/1.8.…I know that because right here it says 1:1.8.…Maximum aperture is often expressed as a ratio like this.…Now check this out.…
This is also a 50 millimeter lens but its maximum aperture is 1.2, as I can see here.…
- 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
Foundations of Photography: Exposurewith Ben Long3h 24m Appropriate for all
Foundations of Photography: Compositionwith Ben Long5h 29m Intermediate
Douglas Kirkland on Photography: A Photographer's Eyewith Douglas Kirkland41m 55s Appropriate for all
2. What Is a Lens?
3. Focal Length, Camera Position, and Composition
4. Depth of Field
5. Choosing a Lens
6. Advanced Autofocus
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