There is a very slight off target in the OP related to the use of EV.
EV is derived by a calculation that does not consider ISO or lighting . It is used to compare camera settings independent of actual light or film ISO (or digital sensor ISO sensitivity). So, aperture/shutter combinations that yield the same EV will yield the same exposure at the same ISO, but EV does not carry up or down ISO sensitivity. An EV of 15 would only be appropriate for bright sun at ISO 100.
Bravo! That always seems to be a pretty difficult concept. Not everyone gets it, because it is actually more simple than they want to make it. I have an article at EV - Exposure Value - and Sunny 16. Definition and chart on the subject of EV, which I found hard to write due to the contradictions. Criticisms welcome.
Meters read EV values, and then ISO settings do produce a different EV reading in same light, only because proper exposure at that ISO then requires other values of camera settings for shutter speed and f/stop. But EV is only about the combination of those camera settings. Specifically, the basic idea is that an EV value is the name of the set of equivalent exposures of all the combinations on that one EV row.
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