Measuring Image Quality
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Visual Evaluation An experienced optical engineer
can tell a great deal about a lens just by looking
at the image. A full discussion of this topic could
fill a book, but here are
some tips. |
| 3-Bar
Contrast The classic USAF-1951 target is
often used to determine the smallest feature size that
can be resolved by a lens. Though still widely used,
the test suffers from subjectivity. Different operators
may disagree on which feature is "resolved".
PixelScope OpticStudio™ allows numerical
measurement of 3-bar contrast, removing the issue
of operator subjectivity. |
| MTF
MTF, or "Modulation Transfer
Function" describes the ability of a lens to image
targets of various sizes in a single plot. MTF is now
the de-facto standard for describing image quality.
PixelScope OpticStudio™ supports measurement
of MTF from a variety of targets, including pinhole,
narrow line, and edge. The new 2DMTF tool simultaneously
measures MTF and EFL in both the X and Y directions
with just a few mouse clicks. Read
more |
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