This calculator is to be used as a guide. Always check the specifications for more accurate fields of view
Step 1: Choose your camera resolution. The most common sensor size for that resolution is chosen automatically. If your camera has a different chip size, you may select it from the chip size drop-down menu. For larger sensor sizes, there may be some dark corners. Check the specifications for maximum sensor size. A vertical cropping of the image can eliminate some dark corners.
Step 2: Choose the lens. Theia's lenses are listed as well as a general lens type. You may select from the list or enter the focal length or field of view directly into the appropriate boxes. For non-Theia lenses with field of view >60° you will get some curved barrel distortion in the image which is not shown in this calculator.
Step 3: Choose one of the input parameters: Distance to object, desired image resolution, or field of view. Only one of these three parameters is an independent variable. The other two parameters will be calculated based on the camera-lens combination you selected earlier.
Output: The parameters and representative images are calculated and displayed. Beware the overview picture doesn't change to reflect the object distance setting. Objects shown in the picture are at a fixed distance which was set when the picture was taken. This overview picture represents the width of the field of view, not the resolution you can expect.
Patents pending. If you have questions on the use or interpretation of this calculator, you may contact Theia Technologies at 503-570-3296.
With Theia's Linear Optical Technology ® lenses, image resolution for objects along a plane (perpendicular to the camera) is constant even though the objects are farther away from the camera at the image edges. For instance, the person in the image center at 20 feet distance is 37 pixels/ft. At the edge of the image (SY110 lens in this case), the person is still 37 pixels/ft but they are 40 feet away from the camera. Other wide angle lenses will decrease image resolution as the object moves to the edge of the image. For more information, read about Theia's Linear Optical Technology ®
For technical support using these calculators, please contact Theia customer service.