Lenses & focus / Learn by doing
Single Autofocus explained simply
What is “Single Autofocus”?
An autofocus mode that focuses once and generally holds that distance while you keep the focus command active. It is often called AF-S or One Shot.
- 01Focus once
- 02Hold distance
- 03Refocus if moved
How do you use Single Autofocus practically?
A small exercise
Focus on a still object, then gently move the object closer without refocusing. See why another focus command is needed.
- Make a starting version and keep it so you can compare fairly.
- Try the change in the exercise. Keep unrelated choices steady where the exercise allows.
- Compare the result at the size your viewer will actually see. Write down what changed and whether it helped.
How does Single Autofocus solve a problem?
It works well for subjects that remain still, such as products or a posed portrait.
What can go wrong?
A subject can move after focus locks. Refocus before another frame if its distance changes.
How do you turn the idea into a useful solution?
Start with the specific problem in your image or brief, try the exercise, and keep the version that meets that need. If the result is worse, return to the starting version and change one choice at a time.
Quick check: can you explain the three ideas in the diagram?
Focus once → Hold distance → Refocus if moved. Explain how each relates to the exercise. Then compare the starting version with your result and choose the one that meets your brief.
Related video lesson
Autofocus lesson — Canon
This related lesson gives wider context for the topic. Camera menus and software versions may differ from yours.
Loading the player connects to YouTube. You can also watch the lesson on YouTube.Keep exploring
Try the idea in a studio shoot
Planning a portrait or product session? Use the glossary with our practical shoot guides, then check the studio facilities and send your confirmed requirements with an availability enquiry.