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Forums > Back > Suggestion: Field Curvature Metric
Scythels
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#10
04-08-2015, 02:59 AM
You can't use MTF to measure defocus if you vary the position within the frame, as the aberration balance will change dramatically and mask the defocus (field curvature).  A plot of defocus (X) vs image height (Y) vs MTF (color/other indicator) is perhaps the best possible way to demonstrate FC.

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Messages In This Thread
Suggestion: Field Curvature Metric - by Guest - 04-05-2015, 03:11 PM
Suggestion: Field Curvature Metric - by Klaus - 04-05-2015, 09:28 PM
Suggestion: Field Curvature Metric - by Scythels - 04-05-2015, 11:14 PM
Suggestion: Field Curvature Metric - by youpii - 04-05-2015, 11:18 PM
Suggestion: Field Curvature Metric - by Scythels - 04-06-2015, 02:10 AM
Suggestion: Field Curvature Metric - by Guest - 04-07-2015, 07:30 AM
Suggestion: Field Curvature Metric - by Klaus - 04-07-2015, 10:15 AM
Suggestion: Field Curvature Metric - by popo - 04-07-2015, 06:41 PM
Suggestion: Field Curvature Metric - by Scythels - 04-08-2015, 02:59 AM
Suggestion: Field Curvature Metric - by Klaus - 04-08-2015, 03:58 AM
Suggestion: Field Curvature Metric - by Klaus - 04-08-2015, 09:50 AM
Suggestion: Field Curvature Metric - by Guest - 04-09-2015, 08:23 PM

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