Hi Howard and group; Do you know if the manual or quick start guide (if one exists) is on I can work this thing? I took a look and didn't see it but I have missed some things before. I took another look at the qst June product review for the 480 but unfortunately they don't get into the interesting issues concerning accessibility. They don't really care if things beep or not. Am I correct that if your pockets are deep enough you can install two optional if filters such as 1.8 and 500? Has anyone here used both a 570 and the 480 for a real comparison? Rich