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EXCERPT page containing first few paragraphs. 2022-07-05 19:01:03

Faint Traces of Lateral Chromatic Aberration

Digital sensors adds a complicating factor in amplifying both astigmatism and LACA; see Astigmatism and Digital Sensors.

Lateral chromatic aberration generates red/cyan color fringes due to lateral displacement by wavelength (color) and does not improve with stopping down. Sometimes this color fringing is very low, and might only be visible on high resolution digital cameras (e.g. 36 megapixels on up) and/or on high contrast edges.


This example shows a faint color fringing at the +10mm offset (see the actual pixels crop, the white building middle left), which is where the MTF chart shows the most divergence between sagittal/tangential lines (astigmatism), the divergence in this case apparently being the result of the color fringing. Interesting to note is that the color fringing is not visible at the edges, showing that lateral chromatic aberration can “come and go” depending on where on looks in the frame.

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