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Download CCDcalc. Lets you compare FOV and camera combinations plus flattener/ reducers
I just did a compare between the 2 scopes using this and there is not a huge amount of difference. Both would need a flattener if you are imaging. With the ED100 and the standard skywatchers reducer flattener, you get down to F7.6.
With the ED120 and the same flattener/reducer, you get F6.4
Not a big difference to be honest, neither is an astrograph, but the interesting thing is that with, say a canon 60da and the 120, imaging scale is 1.72 whilst with the 100 and the same camera, scale is exactly the same..in both cases using the same reducer/flattener combination.
FOV is pretty much the same as well...as expected..
So...you are getting a heavy scope with the same outcomes as the lighter one?
Dilemma
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