While on GFM last weekend I attached 2 of my inexpensive lenses to check out the results with the 1.5x magnification.
With the Zenit 16mm fisheye I was pleased that the normal extreme curvature at the edges was reduced considerably. Still there, but not as noticeable. The 500mm mirror lens showed much less light fall off at the edges. In these cases, the small sensor is a benefit. Bill
