Proper focusing of Arecont Vision megapixel IP cameras for megapixel imaging applications
Director of Field Applications Ted Brahms explains how to focus Arecont Vision megapixel IP cameras. For megapixel imaging applications it is important to use a properly focused, high- quality lens. While proper focus procedures are not difficult, they are critical steps to ensure high quality video.
- Arecont Vision MegaVideo® cameras have CS lens mounts; if a C mount lens is being used, a 5mm C to CS adapter ring will need to be used (this comes in every MegaVideo® box).
- With the camera and a PC on the same subnet, use Arecont Vision’s setup utility, AV100, to connect to the camera. The default display mode is half (1/2) resolution.
- Open the iris to its maximum position and wait for the image to adjust to the additional light. If using auto iris (AI) cameras and an auto iris (AI) lens, use AV100 software to turn AI function off and lock the iris open.
- When using a varifocal lens, adjust the Zoom Control (as shown above) to obtain the desired field of view (FOV). If using a fixed focal length lens, skip this step.
- Choose a specific object in the middle of the depth of field and turn focus ring until that object is fully focused.
- In the AV100 software, pick a specific object in the field of view and draw a region of interest around it by left clicking and drawing a box around it.
- Page up and page down will zoom in and out and the arrow keys will move the zoom window. (See Figure 1)Adjust the focus ring again until the region of interest is in focus.
- Slowly close down the iris control until the foreground and background come into focus.
- Move the zoom window around the image to ensure everything is as in focus as possible. If necessary repeat steps 5 through 8 until the image is fully focused.