Thanks a lot for sharing some of the great work! While none is rare, each is definitely uncommon and not one to expect at any old pond. I have been lucky enough to have Clamp-tipped Emeralds cruising my neighborhood all summer. What always fascinates me is how much of a personality some dragonflies can have. The Clamp-tipped male, for example, patrols open areas near woodland, and often a sizable patch. When he sees an "intruder" such as you or I entering his territory he zips up within arm's reach, sometimes pausing or staying nearby briefly. After this examination, he will continue on his way, and you will have a very difficult time getting that close to him again. If you are looking to net one, do not miss your first chance because it is probably your last.
Photos © Frank Gallo and not to be reproduced without explicit permission