Back-button auto-focus is where it’s at.
- You really really really need to learn about it.
- The main reason why you want back-button auto-focus is so that the shutter button will ALWAYS take a photo when you press it
- And then, you focus by pressing a different button on the back of the camera. Instead of the shutter button BOTH focusing and taking a photo.
- Especially with weddings, this is essential.
- Here’s a blog on improvephotography.com on how to set up back-button auto-focus!
- I use the AF-ON button. Some people use the exposure lock button.
- Styles of focus: One-Shot, AI-Servo, AI-Focus
- One-Shot means: The camera will focus on something once and then will never try to focus on anything else
- AI-Servo means: The camera will keep searching for focus continually. Focus doesn’t lock and stop. Focus keeps changing and tracking the subject.
- AI-Focus means: It will give you focus confirmation like One-Shot to tell you that you hit focus, but allows focus change if the subject moves.
- I use AI-Servo when people walk down the aisle, so that my focus is always tracking the moving subject.
- I use AI-Focus in most circumstances, when the people I’m shooting aren’t moving much.
- Also! You can set up your focus to respond differently. If you want your focus to react more slowly and not react immediately if something else comes in front of your subject, you can set that up. If you want the focus to react immediately when something new comes into frame, you can choose that as well.