Unfortunately, bad design of the optics! Nix for dark corners!

Unfortunately, due to an annoying and completely unnecessary faulty design of the optics is a spying of dark corners or cavities just because of the LED lighting is not possible: The dimming of the light, the image is completely exposed by direct reflection of light at the joint plexiglass lens of camera optics and fiber optics, is precisely because reingeleuchtet by mirroring directly into the optics. Had two lenses or at least one front on the lens plan applied optics (about 1-2mm air between the leading edge and trailing edge of the camera optics lens) indulged in, then you could actually use this device. This leaves only the use of an external light source (flashlight) or use in an enlightened environment. Too bad. Unnecessary design flaw.
Therefore is not suitable for the inspection of pipes, cavities, inaccessible places etc.