Did you try my guess? I just now got the chance (rechargeable mouse batteries choose to die at very inconvenient times). Both forms work, and I made Google Earth move the camera to the new location, so I'm good to go. I haven't worked with Perl much yet, so I'll have to study your example to make sure I understand why it worked and my other form didn't. Many thanks for the help.
Either of these works to set Range:
$cameraInfo->{Range}= 500;
$cameraInfo->LetProperty( Range => 500);