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Coaxing Colour out of a 150mm F8 ED achromat


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About this observation
Peter Anderson
Time of observation
05/04/2020 - 00:30
Observing location
Brisbane, Australia
150mm F8 ED achromat with 5X Barlow lens
2000 ISO

The ED can be encouraged to produce some spurious colour if sufficient contrast is applied. The top section has been contrasted considerably and this action has also enhanced atmospheric dispersion with obvious blue and red fringing on bright sharp contrasty features – even at 40 degrees altitude!

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