The STL on the 5" is going to be superb. The ST is cheaper but does not have the same field of view. The ST on an RC is ok but if I was going to do it all again I would be using a larger sensor. However the STL on an RC8 causes some vignetting, so it is not suited to that scope. On a newt the STL would be fine so long as the secondary has enough real estate. It's a tough question but go for a STX11K. By pass the STL altogether. you will save yourself some former problems.
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