FYI, my twin brother took these pictures of the bore of his 45-70 Trapdoor using one of those LED 5.5mm endoscopes that are sold on the likes of eBay and Amazon. They come with a 5' or longer cable that plugs into the USB port of your computer or laptop. There is a CD included with it, that you need to load, to allow for video or screen capture.
The focal length is a good inch or so and if placed any closer, the image is distorted. For best use, a white cloth cleaning patch or tuft of cotton ball is put down into the bore, which works well to allow the adjustable lights on the endoscope to brighten the image for best viewing.
I thought it was pretty cool!
The focal length is a good inch or so and if placed any closer, the image is distorted. For best use, a white cloth cleaning patch or tuft of cotton ball is put down into the bore, which works well to allow the adjustable lights on the endoscope to brighten the image for best viewing.
I thought it was pretty cool!