![]() *Calculated AFMA values must be converted in order to maximise lens front / back focus correction when using the Sigma dock. So whilst we do see many 150-600mm lenses needing calibration Less focal point that can be calibrated is really a step back. However when Sigma hold approximately a third of the lens market they should really have pushed harder with this one. Reikan FoCal Pro Focus Calibration Software.It offers a phenomenal focal range for the price and this should not be undervalued. ![]() Obviously we approach a review from a different angle to most. To be brutally frank we were disappointed. This of course could be a one off and a more accurate assessment can only be made over time and with more examples. The trial version has some limitations, such as only allowing you to calibrate one lens per camera, not saving test reports, not comparing your results with other users and not supporting beta cameras. We also found that this particular example needed less in terms of correction, especially at the 600mm end than the 150-600’s that we see. Reikan FoCal Pro is not a free software, but you can download a trial version from their official website2. We were pleased to see though was the fact that with this new lens, unlike others in the Sigma range, it was not necessary to convert the calculated values from Reikan’s Focal software / Canon’s af micro adjustment / Nikon’s AF Fine Tune menu before entering the numbers into the Focus settings menu*
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