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    Stewart Guest

    Default what is an APO reflector telescope?



    is it different than a newtonian?

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    Earl D's Avatar
    Earl D is offline Junior Member
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    Default

    Not related to Newtonian at all.

    APO is a TRIPLET design of REFRACTOR

    Most refractors are duplets (two lenses)

    That's all.

    It's a REFRACTOR with a TRIPLET design (three lenses)

    It's an improved or advance or alternative designed ACROMATIC refractor.

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    Actually, an apo is a refractor, not a reflector. Apo is short for apochromat. It means a lens with a higher level of color correction that a normal refractor (an achromat), typically at several times the price. An apo telescope lens can be either a doublet (two elements) or triplet (three elements). The triplets can have a shorter focal ratio for a given level of color correction. Modern apochromats are made with either calcium fluorite or a special-dispersion glass such as FPL-53 as one of the elements.

 

 

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