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Hi Brad,
Does it matter if the trees are in focus or not from the reflector? As long as a tree is roughly in the middle of the EP, then it wouldnt matter if its blurry. You can just align the finderscope to that tree, as long as you know which tree is being viewed through the EP. I used to align my finderscope like that but it usually ended up being considerably off anyways, and required fine tuning regardless. So dont waste too much time on it during the day!
By far the easiest method is to use your 25mm EP, look at an actual star cluster or bright nebula, and then align the finderscope. Also not sure if you know this but finderscopes themselves also have a focus adjutsment (Something I only realised a long time after wondering why my finderscope was crappy!)
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