I did a comparison of the Kenko SGT-20Hi with the Sony VCL-R2037, and the Kenko had the superior optics. Flare and coma were much smaller in the Kenko SGT-20Hi. Looking at Jupiter at night, the Kenko was able to resolve one of Jupiter's moons to a pixel, while with the Sony the moon appeared only sporadically. Chromatic aberration was a bit less in the Kenko. The vignetting that all the telephoto lenses have when the camcorder is in its wide angle zoom was slightly greater on the Kenko.
With a Sony CCD-TR500 camcorder, some telephoto lenses have a problem of being "near sighted"---unable to focus beyond about 50 feet when the camera is zoomed. This problem occurs with the Sunpak CAL-1160 and Kenko SGT-20 lenses, but is not a problem with Kenko SGT-20Hi or the Sony VCL-R2037 lenses, which have enough leeway in the focus to even accommodate far-spectrum red lights.
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