Re: Pop Photo Resolution Lines Per ? MATH

[PhotoRoy6@xxxxxxx]

I did the Math like you did at first.

 

2100 lines in one inch

one inch = 25.4 mm

two inches = 50.8 mm

2.5 inches =  61.5 mm

1 cm = 2.54 inches

therefore 1 cm = 61.5 mm *****

 

1 mm = .0254"

!" = 39.37 mm

2" = 78.74 mm

2.5 " =97.42 mm

 

 

 

 

In a message dated 5/12/2008 7:44:21 P.M. Eastern Daylight Time, editor@xxxxxxxxxxxxxx writes:

Further, your math is wrong. 2100/25.4 = 82 lines, which translates into 41 lp/mm. Keep in mind that these tests are at full contrast (i.e. Black lines on white background) so comparison to normal 50% MTF is difficult.

 

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