David,Some of the best software for HDR prefers you shoot in 1 stop increments and they openly state it. That said, yes, two stop, 3 shot increments work, but the results are coarser.Just a perspective.
Copyright © Nikonians 2000, 2013
All Rights Reserved
Nikonians®, NikoScope® and NikoniansAcademy™ are trademarks owned by Nikonians.org.
Nikon®, Nikonos® and Nikkor® are registered trademarks of Nikon Corporation.