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I'm using a 5" newt with robofocus at the moment and once it was trained for temp compensation I get ccdsoft to autofocus St the beginning of an imaging session then walk away. It does the rest on its own. For a cheap scope I have 5" of aperture, 0 colour fringing issues, 0 focus shifting between subs.. The downside is 5 to 10 mins of collimation prior to imaging.. Small price to pay.
Diffraction spokes become the only other thing people don't always like. I'm considering a curved spider for the scope to remove spikes. Then I have all the upsides of a top notch apo with none of the drawbacks and 1/7th of the cost.
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