While looking at night vision clip ons, think One Leaf, I came across eyepiece cameras. Some of them have small screens and others have no screen but you can wi fi the image to your phone. I'm just curious if anyone here has any experience with them and what can they tell us about them? I understand they are NOT night vision/thermal and all that jazz. Seems like it could be a very inexpensive way to film your shots. Anyone ever use these devices?