Instructions: All input fields and drop-down menus in yellow are changeable. Green fields are results. Help

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Detailed instructions
  • 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 with Theia's lenses as they are designed to cover up to 1/2.5" sensors. A vertical cropping of the image can eliminate those 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.

  • Options: There are two optional drop-down menus. The "Application type" menu allows you to choose a representative picture for an application. There are indoor and outdoor application examples. The "Aspect ratio" menu changes the vertical field of view. This vertical field of view only makes sense when looking at a plane as it is the field of view in the plane at the set object distance.

  • Patents pending. If you have questions on the use or interpretation of this calculator, you may contact Theia Technologies at 503-570-3296.