Which factor is NOT affected by the lens focal length?

The factor that is not influenced by the lens focal length is color accuracy. The primary role of focal length in a camera lens pertains to how the image is projected onto the sensor, which directly affects aspects such as zoom capability, field of view, and depth of field.

Color accuracy, on the other hand, is determined by the camera sensor's ability to capture colors accurately and how those colors are rendered by the imaging system. This involves various factors including sensor design, color filter arrays, and image processing algorithms, rather than the focal length of the lens. Therefore, while focal length plays a significant role in framing a shot and controlling how different elements appear in the image, it does not affect the hues and tones that are rendered, making it clear that color accuracy remains unaffected by changes in the focal length of the lens.