My biggest problem with smart phone apps in a smart phone for a light meter is that in my testing they suffer from flair a lot which skews the readings. That would be a phone problem more than the software. But I haven't tested them in awhile-probably in three years. Has that problem improved? I'm still on a Iphone 6s but I think I tested them on a 5 or maybe even a 4. It certainly appears that my 6s has less flair than my previous SPs.
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