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Apochromatic Triplet Refractors

Apochromatic triplet refractors use three lens elements to bring red, green and blue light to a common focus. That control over color fringing is what separates them from a doublet, and it shows up most in astrophotography, where the fringe lands in every frame.

Our triplets are Explore Scientific, from short imaging astrographs to longer visual tubes. If you are weighing the cost against a simpler design, APO vs achromatic refractors compares them directly.
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