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Thanks for that Mark. I will need to look into the process for doing a visual Ronchi test and give it a go. In the meantime I'll take on board what you have said about the effect of using the main focus knob for fine collimation. I have a 1209 microfocuser fitted to the rear cell so I will look at the diffraction pattern either side of focus using that rather than moving the whole primary back and forth. I will investigate the feathertouch focuser for the coarse mirror focus as well.
Many thanks for taking the time to get back to me on this
John
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