They are a rich-field 4", so quite low mag potential, but lovely wide field with the 100mm aperture. Some people find them frustrating to use as they can be hard to point, particularly if you're not used to them (but I have just the gadget for that!). Not for everyone but they have their uses. I once ran into a family who wanted something 'simpler' than this, and was a bit taken back by that - you can't get much simpler than an Astroscan.
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