'Pre-focus' is a useful technique when you want to capture moving subjects clearly. This involves fixing the focus on a predictable spot where the subject will pass and taking the shot at that exact moment.
It's particularly effective for events like sports days or railway photography where subjects move along a specific path. Although many cameras now come with advanced AF (autofocus) features, pre-focus is beneficial in situations where speed and accuracy are crucial.
Basic Steps and Benefits of Pre-Focus
The basic steps of pre-focus involve setting the focus on a desired spot in advance and taking the shot when the subject reaches that spot. For instance, in train photography, you would focus on a point on the tracks and shoot when the train arrives. This eliminates the need to focus right before pressing the shutter, allowing you to concentrate on timing and reducing errors.
Using burst mode can help accommodate slight timing discrepancies, making it easier to capture sharp images consistently.
Utilizing Pre-Focus with Thumb AF
Pre-focus is also convenient when there's a long wait for the perfect shot. Using thumb AF (thumb autofocus) simplifies the focusing process.
By assigning AF operations, usually controlled by the shutter button, to a button operated by the thumb (such as the AF-ON button), you can focus on shooting with the shutter button while maintaining focus during standby.
This allows you to shoot immediately when the moving subject reaches the focus point, minimizing the risk of focus errors even in unpredictable situations.
The Evolution of Pre-Focus and AF
Pre-focus was once indispensable for action photography, but with advancements in continuous AF and subject-tracking AF, cameras can now keep moving subjects in focus more effectively.
Nevertheless, pre-focus remains useful for capturing precise moments, especially in scenarios where subjects move along a fixed path or when utilizing focus lock.
