I had to fly across a swampy area with some tall-looking trees (like 100 footers) to take some photos of an old, old cemetery. To complicate things, the trees were standing on a 30 foot hill. Trying to make sure I could get as low as possible without hanging up in a tree, I flew to 250' AGL with the camera level so I could see the tops of the trees, and then tilted the camera down. The cemetery was 800' away (yes I did have VLOS), but judging tree heights versus the bird's height was scary. So, I wonder if any of you have used a laser range finder to check tree heights? There are Nikons for $150, and then a little math with Mr. Pythagoris can give me an answer. (Note- deciduous trees without leafs at this point!)