Blue Quality – MultiTest - Reikan FoCal Help

Blue Quality – MultiTest

(See Chart Features for general chart features - changing scales, copying to clipboard etc)

The Blue Quality chart shows the difference between the sharpness in the red channel and the sharpness in the green channel.


  • Red line: uncalibrated blue quality (adjustment value is 0)
  • Green line: calibrated blue quality
  • Black dotted line: blue quality with manual focusing at any aperture
  • Orange dotted line: blue quality at ARQS calibration value (see Aperture Range Quality Score (ARQS) – MultiTest).


See Red-Blue Ratio – MultiTest for an introduction to aberrations.

This chart shows the quality in the blue channel, normalised to the green channel as a reference.

A value below 100% is expected and shows that the quality of the blue channel is less than the quality of the green channel.

If the value goes above 100%, it indicates that the blue image is sharper than the green image.

Red Quality – MultiTest | This Page | Image Motion – MultiTest