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Hi Tony,
I also found that the paracorr does an excellent job of cleaning up the EOF in both the 14mm and 20mm Pentax XW's using #1 or #2 setting. Setting 1 is better but requires me to collimate the mirror very low to reach focus. The paracorr also cleans up the EOF nicely in both the 12mm and 17mm Nagler T4's. The dominant aberration in both the 14mm and 20mm Pentax XW's is field curvature. While the paracorr is not specifically designed to fix this, it does a remarkable job on it.
The 14mm and 20mm Pentax XW's don't show the same degree of field curvature in a larger scope with a longer focal length but the paracorr still improves them.
CS-John B
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