In the circumstances you describe, for me the much more effective AF system of the D800 (compared with that of the D3200) would win out over any perceived difference in "reach" between the twon cameras.I've never had much success with stacked TC's
BrianWelsh NikonianCheck out the Nikonians Team pages
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.