Join Tim Grey for an in-depth discussion in this video Depth of field preview, part of Learning Photography: Autofocus.
- As you're adjusting your camera settings…related to focus and depth of field…it can be very helpful to see an actual preview…of what that depth of field looks like…in the scene before you.…It might surprise you to know…that when you are looking through the viewfinder…on a digital SLR by default you're only seeing the scene…with the lens aperture wide open.…In other words, what you're seeing…represents the minimum depth of field for the scene.…As you stop down the lens…nothing changes in terms of depth of field…unless you make use of the depth of field preview.…
When you're using the depth of field preview feature…on your digital SLR…the aperture will actually stop down…to the setting you've established.…That means less light is coming through the lens…and that can make it rather difficult to see…what's going on in that scene through your viewfinder.…So whenever I'm using depth of field preview…my preference is to use the live view display…on the back of the camera…rather than looking through the viewfinder itself.…
Photographer and educator Tim Grey explores these questions and more in this exploration of focus and autofocus. And because sharpness isn't everything, Tim also details scenarios where blur can have more impact.
- What is focus?
- Calculating depth of field
- Looking at focus limitations
- Employing autofocus one shot vs. continuous
- Using manual focus
- Setting and choosing focus points
- Controlling depth of field
- Using intentional blur and bokeh
- Finding focus while panning