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Doug do not try to image LRGB without a FW, just too painful. If you have to use a manual version but motor driven are better. FF are pretty much standard must have gear with a refractor that does not already have one built in as there will always be curvature on the edges. There are many versions out there that work well, you just have to get all the bits to make them fit, most importantly the correct length.
Mark
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