Missing exposure equation

[Tin Can]

Agree and before anything I try to guess exposure by Sunny 16 in my head

then meter

then decide which to use

I downloaded your file, and will make the slide rule

Thank you

Hello from France!

I have always found, for this kind of "photographic" calculations where a 4-digit precision is useless, that a good ol' dedicated analogue slide rule is more useful than any computer system, be it an expensive mobile phone

Free to download! Electricity-free! Environmentally-friendly! No monthly subscription of any kind!
Can serve as an exposure meter, based on the legendary "sunny-16" rule!