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I remember quite a few posts several years ago about the North Optics ( E.S. Maxvision etc ) 127mm triplets, about the owners having trouble with the focusers, not reaching focus for visual use and not handling the weight of cameras, especially pointing near zenith.
That said, before Xmas I obtained an 127 triplet for myself and use it for visual and imaging, webcam and dslr. Using an Explore Scientific 2" diagonal I can reach focus with most 2" and 1.25" eyepieces with about 5 to 10mm of in travel left. If I use an 1.25" diagonal I have about 30 to 40mm of in travel left on the drawtube. That is with the standard supplied focuser from Maxvision and it has no trouble with the weight of an dslr. Monochrome cameras and filter wheels will be a lot heavier and more problematic, hence the need for more exotic focusers.
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