Fig. 4. Camera f-stop analysis of length (a) and diameter (b) of 0.947 mm wire 0.74 m long cut into random length pieces. Camera settings: ASA 200, 1/23 sec., manual focus with a resolution of 23.1 p mm^-1. Each image was analyzed both with and without sharpening in Photoshop. Horizontal line represents the 0.947 mm point. Vertical line represents 1 pixel width (0.043 mm).