Newcon dn 140 night vision system seem to be out of focus and has poor resolution.

They make a lot of optics. It is unlikely to be a problem with the batteries, but the electronics being run by the batteries, inside a tightly enclosed space especially with night vision.

https://www.google.com/search?q=Batteries+in+Newcon+get+very+hot

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Hello, make sure that the batteries are installed in the correct order. Also, check the battery contacts in the battery compartment and make sure that they are really clean. GB...stewbison

Hello, it could a bad switch. Have you tryed hold down on the switch and see that works. If so, then the switch is faulty. You know that this NewCon Optik CON STARGATE-M is Russian manufactured by Optik one of the six or seven Russian companies manufacturing these NV devises. GB...stewbison

It could be on the top with a small hatch door that holds two AA batteries. Also, there could be a screw in cap on the back that could hold one or two CR123A 3 volt batties.

Unless it has finger crip lever on the top, this piezo electric plunger. The plunger needs to be activated about twenty plus times to build some current for the storage capacitors that will charge a small batteries. stewbison

Sansai PC Webcam @ LINK
Description
*Lens: 2p or 2G2P 1/6" lens
*Interface: USB2.0 high-speed UVC
*Focus range: 5.0cm- infinity
*With VGA (640 x 480) format, frame rate up to 30fps
*Automatic exposure control; Auto/Manual white balance
*Color: RGB24 (true color: 24bit)
*Image Sensor: 1/6 CMOS VGA sensor
*Image Resolution: 2560 × 2048 (interpolated)
*Valid pixels: 1.3mega / 5.0mega Pixels
*Support capture of both still and streaming image.
*3 LED lingts for night vision
*Online snapshot button
*Suitable for notebook & desktop PC
*Plug and play, easy to connect with your computer
*Build in Microphone
*System Requirement: Windows2000/XP/Vista/Win7

The 3 LED lingts panel are for night vision ie. it will automatically light up if the surroundings are very dim. It have a built-in microphone in the webcam.

Use the software settings/configurations to set the microphone eg. skype, "chat" software , etc...

Hope it helps.

Yes, First, when you take the lens off you binocular make sure you are in a very clean room.
All you have to do is unscrew them. Use a good lens clean that is anti-static. If you don't every piece of lent, dusty bugs, flaky shin, etc. will be attached to those lens. stewbison

It's not a problem with your NV monocular. These spots will occur on any image intensifier tube. EXAMPLE: Military standard states that if more than one black spot appears on the tube, then this image tube is rejected for use by the US Military Now like you NewCon Optik DN 140M it manufactured in Russia and they quality control doesn't even match the US Military Standards. On scale 1 to 10; US Military rating for the image tube would be 10+ while the Russian maybe 2+ and I said maybe. Another thing to remember here is that no two image intensifier tubes are the same. It just like finger prints on people not two are the same. It normally. stewbison

The lenses screw out, the electronics are in the body and this involves removing all the screws, including the ones behing the rubber casing. Why do you wish to strip them out?

go to google then click on shopping it is the best way to get items hope this helps.

Check the HV to the tube and see if you can see any discolouration or spots on the tube - they often indicate tube failure. Many binoculars use the one power supply for both tubes as the current demand is very low. Often, one tube operation indicates tube failure, but a wire or connection could be at fault.