BLOG QUESTION ADV: BACK FOCUS

1. What is back focus? How does it affect the image that you are shooting?

2. How do you check the back focus? Are our JVC camcorders different than the Sony EX3? How? What are the key differences between adjusting the back focus?

Back focus is the distance between the rear lens and the sensor. If the back focus isn't set accurately, the image becomes out of focus when you zoom out. You can check the back focus by zooming in to the max. focal length onto the center circle of a Siemens star, or something with a hard edge and contrast (such as black text). When the circle is sharp, you're focused. JVC Camcorders are different from the Sony EX3 because you can only adjust the back focus from within the camera settings, whereas most cameras you have to adjust it from the lenses.