I am using the Wedge on a 4.5" F7 APO refractor known for high resolution. Compared to solar filter, the Wedge retains better resolution from what I experienced. The Wedge works great showing multiple spots in clusters. I do not see the same definition in the sun spot cluster when using a solar filter in an off-axis mask on a SCT. I am not sure that comparisons using these optical systems provides a fair test. But, I am very happy with the Wedge and am confident that it is providing better views than I would have gotten with a solar filter. The manufacturer's comments about the heat sink getting hot are accurate... Don't touch it!