Takahashi TOA-130NFB 5.1" Ortho-Apochromat Triplet Refractor OTA

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This performance of this 4" focuser Takahashi 5.1" ED triplet refractor is too good to let it be called simply an apochromatic scope. Only the term ortho-apochromatic is accurate enough to describe its optical excellence, both visually and for medium format and 35mm/large format CCD imaging . . .