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One of George Watkins blanks with pine cones. This is one of the most amazing blanks I've seen and unfortunately just can't duplicate all the colours in a photo.
It's a lamebrain system, if you understand the realtionship between f-stop and shutter speed you have all the knowledge you need. The only time I have found EV useful is on Hasselblads where the shutter speed and f-stop selected locks them together and if you want to quickly change to a lower shutter speed and the relative f-stop then you just turned the EV ring to the required shutter speed and the corresponding f-stop would give you the correct exposure, but that's the only system I have seen it on and the only use I ever found for it. It wasn't the EV that was handy it was the locking of the shutter speed and aperture range that did the trick. I think exposure meters used to (maybe still do) have a read out for EV so if you took a reading and it gave for example f16 at 250th then the EV read out would be 9 assuming you were using 100 asa/iso.