Fair enough Bill, but my understanding of what the Retra guy said is that the industry is awash with different numbers, some 80% others less - which corresponds with the tests made with the thread starter. And he expands the discussion to GN ratings!
"...although in reality it is (80%) and with some flashguns it's even much lower like Jerry pointed out.
A similar problem is also with GN which we don't publish any more because there is no sense trying to compete with inflated specifications provided by some manufactures."
Furthermore I suspect that regardless of calculations that minimize the effect of 80%,70% or 60% charge to an adjusted underwater stop reduction, these are measurements trumpeted by manufacturers and repeated ad nauseam in publications for manufacturers to position their equipment as the winner in more categories when compared to the competition., if I may cross forum quote...
I feel that if a manufacturers stated specification is not to 100% recovery then the manufacturer should at least make a charge/power curve to time graph available for review - otherwise it is plainly false advertising. Even if all manufacturer agreed on a 'practical recharge percentage' - which it has been said that they don't - I would imagine that the last 20% (or whatever) might fluctuate widely with different capacitor arrays and battery packs.
Frankly, these are very pricey items that, if they represent measurements, they should be held to a standard - before they are forced to a higher standard via legal actions, by class action suits that have plagued other industries.
