False Colour

Images of the lunar crater – Pythagoras

 

Comparison of above images

• comparison of images of the lunar crater Pythagoras from three small telescopes of similar focal length.
• left image: 80 mm Sky-Watcher ED refractor
• centre image: unbranded 80 mm achromatic refractor
• right image:  Bresser Skylux 70 mm achromatic refractor.

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You can see the chromatic aberration (false colour) clearly in the images from the two cheaper instruments, but it is absent from the ED refractor.

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