![]() This allows you to 'tune-in' the best calibration values for your shooting day/scenario. ![]() ![]() By automating the process, FoCal allows you test multiple combinations, subject distances, and on different days, easily. Sigma's USB dock takes care of one of these problems, allowing you to program in the best calibration value for four different subject distances into their lenses, but no camera manufacturer makes it easy to actually determine these values. Further frustrating things is the fact that the optimal value can change due to conditions like temperature and humidity, as well as subject distance, making it rather difficult to nail down the optimal settings. Calibration options are typically available under 'AF microadjustment' (or AFMA for Canon and Sony bodies) or 'AF Fine Tune' (AFFT for Nikon bodies) menu items, with the process being pretty laborious and relying on the user to shoot many shots, throwing off focus in between each shot, to determine the optimal AFMA or AFFT for any camera/lens combination. Reikan has announced a major update to its AF tuning software, FoCal. FoCal automates the process of calibrating your lens to your DSLR camera body, important - if not absolutely necessary - for critical focus when using fast lenses that yield shallow depth-of-field.
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