Will Crockett is a retired portrait photographer for these fine publications and many more:
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VND Calibration

Thanks for watching our ND filter videos, we hope this helps make the process a lot easier.
Download the worksheet PDF here.

If you run into big trouble, please send me an email thru this website. I'll be glad to help you if I can.

You can find our ND videos and plenty more at:

Thanks! -Will Crockett

Grey card with meter for VND Calibration.