The tutorials I've read about shooting ISO test generally involve metering a grey card, then placing it in Zone I for an exposure and Zone VIII for another, then doing this again at different ISOs.

I was wondering... couldn't I just place a light at a sharp angle to a wall to create a 10 stop gradation and shoot that? It seems that it could produce a less confusing workflow. I could tape meter readings to the wall to define the Zones.

Thoughts?

Thanks!
CB