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Technical support > Support selection > Manufacturer Tech Tips
Back Focus, Zoom Lenses
Before adjusting, note how the focus ring on the zoom lens appears to have little or no effect when the lens is set to wide angle, and conversely it has a large effect when on telephoto. With the focus set to far (fully clockwise viewed from the front), aim the camera at a subject over 30 metres away, set to wide angle and adjust the back focus for optimum clarity. Now zoom into telephoto and focus on a nearby object, keep this object in view as you slowly zoom out and if all is set correctly it should stay in focus, or track, all the way out. If possible it is better to perform this adjustment in low light conditions or with a filter covering the front optic as this will ensure the iris is fully open giving the smallest depth of field and, therefore, the best results.
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