I have the 178mm. I have used it briefly on the eagle nebula and it was awesome; low noise too. Not that you would use the MC for solar but my MM doesn't work so well there.
I suspect it would do really well on planets having small pixels. The 178MM would be a plus on dobs because it has a bigger chip compared to say the 290mc. But then again I'm not a fan of the ASI290 on planets; I have one of those too.
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