Lens Minimum Focus Distance

Technical Level: Intermediate-Advanced
techspec_intermediate-advanced

Do you know what your Lens Minimum Focus Distance is?

Sometimes we find ourselves in situations where our camera won’t take an image.  One of the reasons this might occur is because each lens has a minimum focal distance. If we try to focus at a distance less than the minimum focus distance for that lens, the camera will not lock focus and will not take an image. This applies even if we try to manually focus the lens.

DOF and Hyperfocal Distance

Technical Level: Intermediate-Advanced
techspec_intermediate-advanced

DOF and Hyperfocal Distance

 

The Hyperfocal Distance (HD) is an optically calculated constant based on the combination of lens focal length and f stop.  It is used to determine what the best focal distance would be to gain maximum DOF.  If your camera focuses at the HD, any object beyond the HD will be in acceptably sharp focus. With the camera focus set at HD, most items in front of the HD will be in acceptably sharp focus. You should run a DOF calculation to see how far the Near Focus Limit extends in front of the focal distance.   You can still focus where every you want to focus at any focal distance from the camera. If you focus at a distance less than the HD, everything behind the HD will not be in acceptably sharp focus.