Thread: $17 borescope

i use one of the 5.5mm endoscope USB jobbies.

the 45 degree mirror thing is really useful for seeing how good your cleaning regime is, looking for carbon rings etc.

what I did to improve the image quality was to increase the distance between the lens and the mirror. initially just unscrewing the 45 degree mirror attachment as far forward as it would go without falling off. in the end I simply took it off the lens body and used electrical insulation tape to keep it in place a certain distance in front of the lens. does wonders for the focus of the image.

be aware that even on the 5.5mm camera, the attachments are a larger diameter, so they don't fit into a 223 barrel...