I think I'm a bit more confused after your second post, Doug.
I have 2 ideas in mind:
One is a resizeable version of AlsReticle - maybe not full screen but as large as I can accurately draw the reticle .gif.
The other idea is a resizable window with some lines to aid image composition - say centre lines, diagonals, 1/3 grid. These would not be rotatable, they would just resize with the window. This doesn't require a .gif as the lines could be calculated and drawn (based on what I've read so far
!). I haven't done this yet so no doubt it will be a little learning adventure!
Am I getting close to what you want?
Al.