Jimbo, many thanks for that. I'll be printing out that masking info. 'cause I'm sure I'll be reading it over and over. If you get any further ideas on how to deal with the tree tips, please post them; I've really got to get this tree tips issue nailed down once and for all.
Do you have a website where one can take a look at your work? I've read you posts for years but haven't a clue as to what interests you photographically. Also, what part of Montana do you live in?