A simple technique that works with DSLR cameras. It can also work with others.

Bug – © John Neel

Achieving fine focus can be a problem when hand holding a camera with close up subjects such as insects while using auto focus. Most of the time when the subject moves even the slightest, the lens goes nuts trying to find another focus point.

One way to avoid the lens chasing the subject is to turn off auto focus. Generally, using manual focus, you would alter the focus by adjusting the lens by hand.

However, it may make more sense to pre-focus at the approximate distance and to make slight adjustments by simply moving your head back and forth with the torso to bring the lens into sharp focus on the most important detail. This usually makes it much easier to find the sweet focus you need while allowing a more stable handhold on the camera. It also allows you to manually follow the subject without the lens moving in and out as it seeks out your subject.

Most tripod heads are difficult to adjust for focus adjustment due to the way they restrict back and forth movement. Almost all tripod heads rotate in a series of arcs relative to the tripods position. The only straight line that can be accomplished is vertically. Tripods are designed for adjusting camera angles, fixing the view, and maintaining a stable position for long exposures.

When straight-line movement is needed while working on a tripod it is advisable to use a macro adjustment rail to change the focal distance. Macro rails are designed specifically for fine focus adjustment with small subjects. Mounted on a tripod, they offer adjustments that can be set parallel to the lens axis.

Please have a look at some of my other posts here.

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