Table 1. A Comparison of the Measurements of the Ruler Image at Various Magnification Ratios Captured Using Three Cameras .

Camera Models and Brand		Nikon D1x		Canon 5D Mark III		Canon 60D
Sensor Size		23.7 mm		36 mm		22.3 mm
Westminster Linear Scale	Size of Ruler Image Captured on Camera
1:1	23.7		36		22.3
1:1.5	35.6		54		33.45
1:2	47.4		72		44.6
1:3	71.1		108		66.9
1:4	94.8		144		89.2
1:6	142.2		216		133.8
1:8	189.6		288		178.4
1:12	284.4		432		267.6
1:15	355.5		540		334.5
1:20	474.0		720		446
1:30	711.0		1080		669
1:40	948.0		1440		892
1:55	1303.5		1980		1226.5
1:85	2014.5		3060		1895.5