Using teleconverters with zoom lenses is a similar process, calibrate the zoom lens bare and as a separate calibration zoom lens with teleconverter (see link on zoom calibration below). The distance required for calibration should take in to account the extended focal length, for example, 1.4x TC and 200mm lens the focal length would be 280mm (see link on calibration distances below). Once calibrations are complete the camera automatically recognises each combination and automatically applies the correct adjustment as needed. To use an example, given a 200mm prime lens and a 1.4x TC and a 1.7x TC.Ĭalibrate each of the following combinations: Pro Calibration Software License Includes Standard Hard Target 150mm Windows and Mac Compatible Works with Most Canon Cameras & Lenses Show More. FoCal can be used to calibrate auto focus with tele-converters (also known as lens extenders or ‘TC’).ĭigital cameras which support tele converters know which lens is attached and additionally know when a lens is attached with a tele converter.Ī separate calibration value is stored inside the camera for the bare lens and for lens+telecoverter combination.įocus calibrate the bare lens normally, then as a new calibration attach the teleconverter and calibrate again.
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