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>try the NFP rule which is the new hotness, as the 500 one is quite obviously depreciated with modern cameras
>input my FF camera and 21mm lens settings, and set the rule for very slight acceptable trailing instead of purely strict
>f1.4 gives me 9.09s
>try with f2 because at f1.4 I'll have too much coma
>f2.0 gives me 10.03s
>what
>try f16 for shit and giggles
>gives me 32,49s
Okay what the fuck, and did anybody on the planet check this formula out? Because I can tell you this doesn't make any sense. Even if I could see a star at f16, I won't get acceptable trails with 32 seconds. A dumb 200 or 300 rule or something makes more sense than this.