23-telecine produces 30FPS video having 12Hz judder of high contrast edges that persists for 8 ms plus 40% combing @ 6Hz.
46-telecine produces 60FPS video having 12Hz judder for 8 ms but no combing.
55-telecine produces 60FPS video having no judder and limits combing to 20% @ 12Hz.
12Hz & 10 ms are generally used as rule-of-thumb thresholds for human perception beyond which average noticeability drops off sharply.
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[A/a__________][B/b__________][C/c__________][D/d__________] p24 Source = 42ms/frame
: :::: : :::: : Judder = 8ms (i.e., 20%) @ 12Hz
[A/a_______][B/b_______][B/c_______][C/d_______][D/d_______] p30 23-telecine
:::::::::::::::::::::::: Combing = 67ms (i.e., 40%) @ 6Hz
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|<--------------------------1/6s-------------------------->|
[A/a__________][B/b__________][C/c__________][D/d__________] p24 Source = 42ms/frame
: :::: : :::: : Judder = 8ms (i.e., 20%) @ 12Hz
[A/a_][A/a_][B/b_][B/b_][B/b_][C/c_][C/c_][D/d_][D/d_][D/d_] p60 46-telecine
Combing = none
Code: Select all
|<--------------------------1/6s-------------------------->|
[A/a__________][B/b__________][C/c__________][D/d__________] p24 Source = 42ms/frame
: : : : : Judder = none
[A/a_][A/a_][A/b_][B/b_][B/b_][C/c_][C/c_][C/d_][D/d_][D/d_] p60 55-telecine
:::::: :::::: Combing = 17ms (i.e., 20%) @ 12Hz