Join Tim Grey for an in-depth discussion in this video Establishing close focus using extension tubes, part of Learning Photography: Autofocus.
- In certain situations you may find…that you want to get very close to your subject,…and therefore, you want to focus very close…in front of your lens…and that represents a challenge for many lenses.…Some lenses can only focus as close as a few meters…from the front element of the lens.…There are, of course, specialty lenses…that are able to focus very close to the front lens element.…A macro lens, for example, is specially designed…to be able to focus very close,…so you can get the lens right up almost against the subject…and still establish good sharp focus.…
Of course, not all lenses are able to focus very close.…But there's another solution,…a very economical solution I might add,…and that is the use of an extension tube.…Let's take a look at an example.…I'm set up obviously fairly close to a subject.…I'll use the Live View display here…and try to establish focus manually.…Setting my lens all the way…to the closest focusing point,…I'm still not able to achieve focus for the subject.…But I can use an extension tube,…
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