Hello everyone! I recently bought a small raspberryPi board, with its small "camera board". (link for camera reference) I want to use a CS lens on this camera (CS lens from the security camera industry). I have been able to attach the lens, and it focuses very good, yet not "excellent". Specifically, the center of the image is focused, yet the edges are blurry. I will go down the list of things I have done to provide some background: - The raspberry pi camera alone works awesome. Very good image quality. - There is a seller in eBay that sells his own "rPi camera board" with a close range CS lens. - I ordered this camera board and took it apart. - The CS lens mount is made out of metal. When I installed a longer range CS lens on this mount, the image was blurry. I could not get it to "focus" with sharpness. Trying things out, I removed some material from the top part of the mount - this makes the CS lens sit CLOSER to the image sensor. With this setup, I was able to get the long range CS lens to focus very good. Yet, as best as I could get it, the "edges" of the image are out of focus. Now is where I have doubts: What else can I do to make the image sharp? I don't think it is any changing the distance between the image sensor of the camera and the CS lens. (Is that the "focal point"?) As a side-note: I have an Axis 211M camera. Excellent unit. In between the CS lens and the image sensor, Axis has setup a small "pane" of transparent material. I don't know if it is glass, acrylic, or some "boro-silicate" glass type. Its shape is the same exterior dimensions as the image sensor... yet it is thick. I was wondering if this somehow helps the image sensor receive a focused image from the CS lens? I can upload photos of the components if so desired by someone. All help and direction is greately welcomed. Thank you!