Encoder and image capturing apparatus

An image capturing apparatus comprising an encoder,

• wherein the encoder includes:
• a scale having a pattern column with a plurality of patterns for periodically changing a physical characteristic;
• a detection element array disposed movable relatively to the scale and including a plurality of detection elements configured to detect light from the pattern column are arranged in a moving direction;
• a signal processor configured to convert an output signal from the detection element array into position information,
• wherein the detection element array includes first detection elements, second detection elements, third detection elements, and fourth detection elements,
• wherein the first to fourth detection elements are arranged in order of the first detection elements, the second detection elements, the first detection elements, the second detection elements, the third detection elements, the fourth detection elements, the third detection elements, and the fourth detection elements, and
• wherein the signal processor generates a first signal based on an output signal from the first and third detection elements and a second signal based on an output signal from the second and fourth detection elements.