Join Ben Long for an in-depth discussion in this video Servo focus, part of Photography Foundations: Lenses.
This is the Canon 24-105 EFL. In addition to its great zoom range of 24-105…millimeters, which makes a fantastic walk-around lens, its four stops of image…stabilization, its constant f4 aperture across its zoom range, the low…dispersion glass, the red stripe around the end of the lens, which lets people…know that you're a discerning shooter.…in addition to all of that, it makes a great pendulum.…Now the problem is if I stick a camera down there and I want to shoot this lens…as it swings back-and-forth, I got problems, because I'm not going to be able to…focus on it very easily. Here's why?…Focus of course is a matter of the distance between the lens and the camera and…if I focus right here, it's immediately swung out of focus, and-- stop that!…it's immediately swung out of focus and my image will be blurry.…
Now I can try to half press the shutter button along the way and keep up with it, …but it's really difficult to do when something is moving that quickly.…Now, you may think I don't angle my lenses from the ceiling, so what does it matter?…
- 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
Photography Foundations: Exposure (2010)with Ben Long3h 24m Appropriate for all
Photography Foundations: 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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