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I agree Rickster if it were only available light levels, but the other issue to consider is resolution, the smaller the apature the lower the resolution. By using a 2" mask on a 4" scope you are effectively stopping the scope down and cutting the resolution considerably and the ability to magnify in half; max usable mag 2" scope 100X, 4" scope 200X.
This may not be an issue for full disk viewing but could cause constraints when trying to view sunspots in detail.
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