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Jim,
I just bought one of the cheap ones on amazon for my smart phone got the 10m one. Probably wouldn’t go beyond 5m in the future. Just too long and unlikely to ever use that length now that I’ve used it. The one I got claims a focal area from about 1” to 15”. I think it’s probably centimeters but could be wrong. But in the confined spaces I’ve been in (ac ducts) it’s been challenging. It works and some is probably a learning curve for me on controlling it. Also the LEDs are nice but they mess with the image abit. Next is to maybe get a flood/flashlight into the space and then not use the LEDs and see how that is. Also it didn’t come with any of the “included” accessories it claimed so I am a little peeved.
Robert
PS. What lake in Montana? If I read your name right. My wife is from Billings MT and we really enjoy the flathead area.
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