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Alex 4" F/4 refractor is going to be like looking through a fish bowl. You'll need drop a decent amount of cash to compensate the field curvature.
Next time we get a night out I'll give you some time with my 4" F6.5. Pretty damn good as a rich field scope. With my 30mm it give a true field of 3.5 degrees. To put that into perspective that's all 3 stars in the Orion's belt in the same field of view with a bit of room to spare.
An ED80 is a good choice and decent value. But I suspect you'll be wanting for aperture. TBH, and this is my opinion only. The views from smaller then 100mm just don't really throw up a particularly interesting view when compared to a 100mm telescope or above.
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