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The Lumicon one is pretty good - just tighten all six bolts really well to remove any slippage! It comes with a focal reducer than can be removed (I did as mine showed coma). I use it on a C9.25 with a Meade DSI II mono as the guide camera and a modded DSLR in a cool box as the imaging camera. Once it is all set up I find up to 30 minute subs are readily achievable.
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