The Field Of View Equivalency Factor: Image Circles & Olympus Four-Thirds

The Field Of View Equivalency Factor "The FOV Thing"
Image Circles, Nikon DX lenses, and FOVEF replacing actual FOV Cropping December 26, 2004
FOVEF: Introduction • FOVEF: Image Circles FOVEF: Olympus Four-Thirds Lenses • FOVEF: Nikon DX Lenses • FOVEF: How Do You Get That Number? FOVEF: Degrees and Angles Of View • FOVEF: Conclusion
DX Lenses Nikon's DX lenses are another answer to matching a sensor, just like the Olympus E-System lenses. As you can see below, the image circle of a Nikon DX lens is smaller than that of a 35mm lens image circle. Since the image circle is smaller, it captures more of the image than a 35mm lens on a Nikon DX Sensor. However, since the imager is smaller than a 35mm imager, your Field Of View is going to be much different.