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Gary
This one has 60mm secondary. Bought a 70mm but have not decided yet if it is worth the bother of fitting it - vignetting on a QHY8 is not too bad really. I routinely use a GSO 2inch Barlow to overcome some of the limitations of the supplied Plossl eyepieces for visual use - they are way below the quality of the scope at f4, but are usable at f8.
Ray
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