BackFocus chart; Black and white test pattern for testing back focus on high-end digital cameras; Spiral lines increase in width gradually from very thin to 90 to 100 times the width on the outermost spiral; The space between the lines increases at the same rate as does that of the lines; Side by side spirals enable the user to determine critical back-focus with a digital camera

'100':30 '90':28 'back':10,65 'back-focus':64 'backfocus':1 'black':3 'camera':17,70 'chart':2 'critic':63 'determin':62 'digit':16,69 'enabl':58 'end':15 'focus':11,66 'gradual':23 'high':14 'high-end':13 'increas':20,43 'line':19,42,53 'outermost':36 'pattern':7 'rate':47 'side':54,56 'space':39 'spiral':18,37,57 'test':6,9 'thin':26 'time':31 'user':60 'white':5 'width':22,33

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