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My eyesights not the best either (being a welder for over 20 yrs) but I manage to get good focus (according to the guys in IIS) I've only got the standard cheese-grater focuser on the refractor..Admittedly, I have a radial arm on one focuser knob which makes life a hell of a lot easier.
Yes, I'm getting that red/blue separation on the screen too lately. From past experience when that happens, the final resultant image is usually not all that great.
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