I have to admit, it's one of the reasons I like shooting nature with a digital camera. I have 300 exposures and a subject that's not going to move for a very very long time. :) Shoot a few, change the f-stop, shoot a few more, (Now, if I can just figure out a way to get the moon just a BIT more to the north now and then.....) hehe Thanks for the links Misha. I'm always looking to learn more. ~ Rich