rick2726 0 Posted January 6, 2010 Please pardon if some of my technical lingo is incorrect.... I have a specific camera (CCD and Lens) question. I have installed a 2.2mm fixed 1/3"ccd dome camera in and am experiencing a distorted image around the perimeter of the field of view. These cameras are installed on a flat ceiling and aimed directly at the floor and are intended to view a designated 12' diamerter circle. I selected the 2.2mm based on the need to view a 12 by 16 foot image with a very limiting 8 foot distance between the lens and the surface. Like mentioned above the image is 'rounded' and/or distorted on the perimeter. Using the specotech.com image calculator, I understand that a 1/2" ccd camera with a 3.2mm lens should provide the same field of view. My question is, will this type of camera also have the same image anamolies as the 1/3" ccd? As a point of reference, I can take a 'snapshot' with my cheap digital camera from the camera position and get the full image without any distortion. However, I find it nearly impossible to directly compare the specs of my Olympus camera's lens with those of the CCTV camera options I am looking into. Thanks for any input that you have. Share this post Link to post Share on other sites
Soundy 1 Posted January 6, 2010 "Barrel distortion" like that is to be expected with a lens that short. A 3.2mm lens on a 1/2" sensor will have the same problem. It's akin to the "fisheye" effect you'd get with, say, a 12mm lens on a 35mm film camera. There are two ways around it: software processing to adjust the distortion, or a specially-designed lens that would probably cost substantially more than the camera itself. Share this post Link to post Share on other sites
rick2726 0 Posted January 6, 2010 Than-you for your prompt reply. I understand why it is called 'barrel distortion'. However I am still mistified as to why my Olympus Digital camera can shoot a picture the same distance (8') and have an image wider than 12' with no distortion. Any input? Share this post Link to post Share on other sites
cglaeser 0 Posted January 7, 2010 Than-you for your prompt reply. I understand why it is called 'barrel distortion'. However I am still mistified as to why my Olympus Digital camera can shoot a picture the same distance (8') and have an image wider than 12' with no distortion. Any input? Several months ago my security camera detected a burglary in progress. I called the police and they arrested three suspects. I gave the photos to the police, but when the prosecutor saw the photos, he decided not to proceed with the case due to the extreme barrel distortion. OK, I'm kidding about that last part. Minimizing barrel distortion in a digicam is a design objective. In security cameras at wide angle, no one cares. Best, Christopher Share this post Link to post Share on other sites
hardwired 0 Posted January 7, 2010 If you really want to eliminate that distortion, and are willing to spend a fairly large amount for it, (~$450.00 retail) Theia lenses, http://www.theiatech.com/ will do the job, I've used several on different jobs, and been pretty happy with them. Share this post Link to post Share on other sites
