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The scope scores 1/7th wave peak to valley near the red end of the spectrum which is quite good.
It's only a partial test though and doesn't indicate how well the scope will perform at other wavelengths/colours. They've likely picked the best performing wavelength to present to buyers, though the scope is probably at least decent overall and well worth it's price.
You could use a blue and a red CCD filter at high magnification and see if you're able to detect an obvious difference in the sharpness and resolution of an object.
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