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    Opticron

    hi everyone:) i am new here:) i have an Opticron HR 66 GA ED from 2003. two HDF eyepieces for 38x 20x magnification. also a full frame Canon 6d camera. does worth to buy the 40215 Telephotoadapter to convert the HR66 into a (800mm/f.12) telephoto with my dslr+t ring? or it is more preferable...
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