The shift to mirrorless has largely helped to eliminate one of the biggest issues of DSLRs; Focus calibration. And although mirrorless is now selling at a higher rate than DSLRs, there are still a lot of them out there. For example, even though I bought half a dozen Panasonic mirrorless cameras for video a couple of years ago, I still have 14 or so Nikon DSLRs. Every time I get a new autofocus lens, I need to calibrate it to each body I plan to use it with.
One of the leading products to help with calibrating your DSLR autofocus lenses is Reikan FoCal. This software makes you shoot a bunch of images and dial various settings in your camera in order to give you a result that ensures sharp focus every time. Well, now, FoCal’s gone mobile with a new app for iOS, iPadOS and Android.