I saw two 150s in action at AstroFest and the data coming out of them was quite impressive. Usually, imaging will show up issues with colours, etc, the visually won't necessarily. They're not a small or light scope, but one of the chaps images with it riding on an AZ-EQ6 quite successfully.
I own a 100 and the sharpness of some of the images I've collected defies what I believed I would ever see with a 4"...
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