How to Make a Telephoto Lens for a CCTV Camera

Written by marshal m. rosenthal
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A telescope lets you see at a greater distance than when looking at something with the naked eye. You can make a telescope that will work as if it were a telephoto lens when placed on the front of a closed-circuit TV (CCTV) surveillance camera. A few household times will be needed, as will some items from a hobby shop. The CCTV surveillance camera will not be damaged in any way by having its lens affixed to your homemade telephoto lens.

Skill level:
Moderately Easy

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Things you need

  • 3/4-inch diameter cardboard tube, 4 inches long
  • 1/2-inch diameter cardboard tube, 6 inches long
  • Convex lens
  • Concave lens
  • Bonding glue
  • Duct tape

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Instructions

  1. 1

    Stand both of the cardboard tubes on a table. Apply bonding glue around the rims of the open ends at the top of the tubes. Place a lens on each tube: put the convex lens on the tube to your right and the concave lens on the tube to your left. Press down on the lens on each tube with your hands. Remove your hands after a minute has passed. Let the bonding glue set for three hours before continuing.

  2. 2

    Insert the end of the 1/2-inch diameter tube that doesn't have a lens attached to it into the end of the other tube that doesn't have a lens glued to it.

  3. 3

    Place the end of the now-longer tube that has the convex lens on it against the lens of the CCTV surveillance camera. Wrap strips of duct tape around the end of the tube and the side of the camera's lens housing to secure the two together.

  4. 4

    Pull or push the tube from the end farthest from the camera's lens until the image being seen on the monitor that the camera is connected to is in focus. Tape the two tubes together with strips of duct tape so that the tube you moved is now fixed in place.

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