Bob thanks for the link to Craig Stark's old review. It reviews the old Orion version of this scope, which had the single speed focused and the larger secondary. The Skywatcher MN190, as it is sold today, has a dual speed focused and a smaller secondary. The smaller secondary improves visual contrast and still will fully illuminate an APS-C size sensor. Issues with focuser slop can usually be traced to too much back focus requirement in some camera setups which flex the focuser extension. Most Canon DSLRs will reach focus with just 10mm of back focus and thus the slide out extension is not required, just wind back the knob to adjust focus. Starlight and Moonlight will eventually provide the right adaptor. Re tube flex itself, I have none, but maybe this is because I run a top mounted dovetail bar on the rings to mount my guidescope. If you use a long top and bottom mounted dovetail it seems to adequately support the ota. Being a scope with a corrector and a mirror it is heavy for its size but pretty easy to balance, however as with many mounts having it slightly east side heavy helps with gear engagement and reduce over correction.
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