HOW TO ADJUST BACK FOCUS

Let’s discuss how to adjust back focus on a camera. Setting the back focus is a necessary step in making sure that your shot is always in focus regardless of your zoom position. Most professional video cameras have a back focus adjustment knob near the mount flange at the back of the lens. Back focusing a camera is a fundamental process that has a huge impact on your overall image quality and show experience. Let’s take a look at the steps:

Begin by setting your camera on a tripod or stable mount, with your subject (back focus chart or other contrasting object) approximately 10’ away.

The next step in the process is to make sure you set your lens F-stop to its widest opening (lowest f-stop number). This adjustment allows more light to enter the lens, giving you better visibility and control over the focusing process.

Next, zoom your lens all the way out and focus on a Siemens star positioned around 10 feet away. If you don’t have access to a siemens star, focus on an object that has as much detail as possible so you can properly dial in the focus.

Using the back focus ring on your camera, make adjustments until your image is perfectly in focus.

Using the viewfinder, and additional features like the peak indicator or focus indicator bar, can help in the focusing process. This step is important because it lays the foundation for achieving precise focus.

Now, it’s time to fine-tune your focus. Zoom your lens all the way in and focus on an object using the hand controls that manage the front element of the lens. This step is crucial in establishing the proper focal relationship between the front element of the lens and the back focus ring.

Achieving the perfect focus might require some repetition. Don’t hesitate to go back and forth between your zoomed out and zoomed in image to make fine adjustments. This process ensures that you dial in the optimal focus for your specific shot.

Once you are satisfied with the focus, it’s time to secure your settings. Tighten the back-focus knob to lock in your adjustments. This ensures that your calibrated focus remains intact throughout your event.

Following these steps should guarantee that your focus is maintained through the full range of zooming. If you have any further questions or need rental cameras for your next event, reach out to Nationwide Video at 800.935.2323 or info@subrent.com.