![]() This method is primarily targeted for Canon and Nikon DSLRs which provide remote live view and remote focus actuation using manufacturer provided software. Here I explain an easy method to perform this correction in a more repeatable and consistent way. In order to compensate for this offset error most manufacturers provide a firmware feature called ‘AF fine-tuning" or "AF micro-adjustment". ![]() The degree by which this offset error will affect the perceived sharpness of a photograph will depend on factors such as aperture and subject distance. Due to various tolerances in manufacturing and calibration at the factory, offset focus error may be present in camera’s AF sensor, AF lenses or both. Thanks to scaling trends for CMOS image sensors most of today's DSLRs feature sensors with more than 12 million pixels, in order to take advantage of all of these pixels, it is essential that the projected image on the sensor be perfectly in focus.
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