Why Won't My Telephoto Lens Focus?

A telephoto lens allows for a long focus in photography, with a shorter length than that of other long-focus lenses. Any lens with a focal range above 100mm is classed as telephoto and will allow you to zoom in close to a shot without jeopardizing pixel quality. Telephoto lenses are ideal for capturing photographs at a variety of distances and allow you to photograph without intruding upon your subjects.

Switching the mode to auto focus (there is a switch at the front of the camera near to where the lens detaches) is more effective for situations where you may need to shoot quickly or capture a subject that is fast-moving. Using auto focus mode will nearly always allow you to focus quickly and accurately using the camera's built-in sensors but is often less suitable for macro shots or where a very specific focus area or depth of field is required.

If you always use manual focus with your telephoto lens, it is likely that you will struggle to focus correctly on most of the shots you take. Using the manual mode deactivates the camera's built-in ability to focus on a specified subject, and the lens must be twisted very carefully at the front to bring the subject to a perfect focus. Every time you move, the photo will need refocusing. The manual focus, however, is ideal for shots where you can take your time, specifically macro (close-up) shots, which require a precision focus the auto focus might not correctly pick up on.

Although the telephoto lens allows you to zoom in accurately from a distance, it is often possible to over zoom on a subject that is quite close. If the auto focus is struggling at an extended zoom and the subject will be there for a while, try manual focus; otherwise take a few steps back from the subject matter to regain clarity of focus and crop the edges of the photo in the editing process instead.

There is a range of settings to help you auto focus your subject. The Wide focus is useful when you are shooting at a wide angle without a specific point of focus; the Spot focus is appropriate if you have a single point in the picture you wish to retain focus; and Local focus allows for several points of focus within the lens, ideal if you are shooting a variety of subjects at different depths of field.

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