AV20175DN-xx | How to focus lens

Environment:

• AV12176DN-NL
• AV12176DN-28
• AV12176DN-08
• AV20175DN-NL
• AV20175DN-28
• AV20175DN-08

Procedure: Focusing the Cameras

1. Open a live view of the camera from your web browser
2. Loosen the lens lock screw using a phillips head screwdriver (if necessary). Only do so if lens seems very tight when turning. Lock screw should be tightened enough to provide some friction against the lens to avoid focusing problems.
   
3. Manually rotate the lens to adjust the focus until the desired image is obtained.
   
4. For some lenses, a focus shift will occur once the bubble is in place. Hold the bubble up to the lens when focusing to account for the focus shift or see the “Focusing Alternate Lenses” section below for further instruction.
5. Retighten the lock screw if necessary.
6. Install the Dome Cover by aligning the captive fasteners with the mating threaded holes on the camera housing.
7. When mounting the Dome Cover to the Camera Housing ensure that the gasket is properly seating and not folded. Failure to do so may result in water and dust ingress

Focusing Alternate Lenses: When focusing the 6mm, 8mm, 12mm or 16mm lens options you will encounter a focus shift when using the bubble. To account for this follow these steps:

1. Focus the camera without the bubble.
2. Rotate the lens per the chart below. The rotation will account for most of the focus shift.
3. Put cover with bubble on. You should be close to being focused.
4. Remove cover and rotate a couple degrees at a time in either direction until you gain the desired image.
   
   Example: Using a 16mm lens you will focus the lens without the bubble until you get the desired image. Rotate the lens almost ¾ of a turn (250°). Put the bubble on and view the image. It should be almost in focus. Remove the bubble and rotate a degree or two in one direction and view the image with the bubble on. Depending on the image you may need to adjust in the opposite direction or continue in the same direction until the desired image is obtained.