Alden IA

I am using a cctv camera for a scientific application and need to get a wide feild of view with minimal distortion as the images need to be used for measurement. I bought a 1.8 mm lens but the fisheye effect is to distorte dfor me to get accurate results. What is the widest angle lens before it starts to distort? My problem is I have a maximum mounting height of 16 ft (the distance between the roof and the surface i am studying) but would like to get ~30 ft of view. The camera need to point straight down as I ma tracking motion.

I am in the process of laying out a grid to "calibrate" the fisheye. By knowing the coordinates I could apply a correction to the data set. I am tracking floats in a scale model of a river to establish the surface flow patterns and velocities. I would like to avoid going to a 6mm camera because I would have overlapping feilds of view and processing would become tedious.

I guess my question is at what point does a lens start being a fish eye lens? 3mm? 4mm? I don't know but figured someone else might. The mast idea is out of the question because I am indoors with a fairly low roof for about 2/3 of the area I need to cover. Any help woul dbe appreciated.

Brand new unit just recieved it yesterday and wired it up yesterday afternoon. After playing around a little this afternoon I would believe it to be be a bad filter circuit and maybe even a rectifier, I put a rectifier on the supply and it clened up some, but it was even better when I addded a filter Cap. I aslo called JVC and the tech there suggested that the camera was the problem. At first I figured I needed to jumper something or change a DIP. Thanks.

I recently bought a JVC TK-C920U camera it is 24vac/12VDC. When powered via an Altronix ALTV2416300ULM power supply. When the camera is powered from the 24vac the image scrolls vertically and has bands of noise in the horizontal direction. When I plug it into a DC supply the picture is steady and clear. Any suggestions on what I am doing wrong? I really want to use the ac supply as I bought it to power several cameras.