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My Astrosystems collimator changed my life (for the better). It is a good snug fit in the focuser, & the magnetic barlow makes primary adjustment easy.
I find that getting the mirror to ambient temperature is also critical to get the best out of it. It needs a good 30+ minutes with the fan running to produce really tight star images.
Doug's point about the transparency is spot on. I have never been able to see all five stars in Musca naked-eye from my backyard before, but I did last night. We're only 4km from the city so the light pollution is pretty bad.
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