1. SFRplus Normal Distorted for 85-120º FoV

Distortion parameter = 0.833.

Optimum Field of View = 95.5o diagonal.

Usable Fields of View = 85-120o.

5×9 squares shown

2. SFRplus Extra Distorted for 120-150º FoV

Distortion parameter = 1.167.

Optimum Field of View = 134o diagonal.

Usable Fields of View = 120-150o.

5×7 squares shown

3. SFRplus Custom Distorted for up to 160º FoV

Distortion parameter = 1.4.

Optimum Field of View = 160o diagonal.

Usable Fields of View ≥ 150o.

5×7 squares shown

The extreme corners of the image cannot be measured much beyond 160o.Caution is advised when using these extremely pre-distorted charts with high resolution cameras because the relatively small chart height in the center can affect measurements. See Chart Quality Index (CQI).

4. eSFR ISO Extra distorted for 120-150º FoV (shown with extra wedges)

Optimum Field of View = 134o diagonal.

Usable Fields of View = 120-150o.

Enhanced version shown

Any version of the eSFR ISO chart can be produced in inkjet or LVT film media with any degree of distortion.

5. SFRreg charts for extreme Fields of View,

showing the SFRreg center chart for ~90 degree (horizontal angle) with added individual SFRreg charts for angles outside 90 degrees (can go well over 180º total FoV)

The SFRreg center chart is designed to cover central 90o in cameras with much larger Fields of View (can be > 180o). It is intended to be used with additional single SFRreg charts that typically face the camera.

A top view of a typical arrangement is shown below. The charts on the sides typically represent two (or more) charts located in the corners (and possibly sides) of the camera’s field. For more details, see SFRreg Instructions.