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I use the ZWO 60mm guide scope with an ASI130 guide camera and it works very well. I have used this setup for a couple of years on all my scopes. I use Metaguide software, which is free. I found Metaguide much easier to use than PHD. One nice feature of the ZWO guidescope is that it is lightweight, something i view as important. It may not matter with what your doing, but if you were running near the imaging weight limit for your mount it can matter.
BTW you certainly can imaging with an achromat scope, provided you stick to narrowband imaging where CA is not a factor. However that is a big learning curve from where you are now.
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