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I've got a 50mm zwo guidescope I picked up here second hand. I've also tried a 60mm and didn't really see much difference - but it had a bigger fov for more stars. I use an asi290mm - but only used that as I already had one for Halpha video astro (EAA or whatever you want to call it). Definitely phd2 for all the reasons mentioned already. And all mounted the same as Martin has done
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