The 6.6-66 is a fantastic lens- my favorite of all the S16 zooms I've used for all the right reasons (contrast, sharpness, flaring, even the barrel itself). I think there is also a matched sister zoom-- 10-135 or something like that. I would agree with Chris's friends in that it's sharper than a lot of primes out there (probably not ultra16's, but certainly superspeeds)
i used the canon f/2.5 11.5mm - 138mm almost entirely @ f2.8 for about 3500' feet of film recently. i noticed that there's a significant amount of color fringing around highlights. it only occurs when the backlight is more than 4 stops over. it's not so noticeable in closeups, because your eye is elsewhere; it's more a wide shot where you have a character coming in from a brightly backlit door, say, and the eye is looking carefully at the detail. the lens is really solidly built, and feels great, but i have a feeling that optically there's a better choice out there. the rental house, abel cine tech had an angenieux f/2.1 11.5 - 138 that was out: we were just a student film getting a deal on what was there. my nikon full frame primes (@ f2.8 not wide open) on a digital still camera with a 23mm x 13mm size sensor control CA color fringing better. i also intercut the zoom with a zeiss 16mm T 1.3 used @ f/2.8. the prime controls flare better, controls CA slightly better, and is about the same sharpness. overall the director was very happy with the results and actually enjoyed the lens imperfections.
CANON Super16 Zoom 6.6/66
in Lenses & Lens Accessories
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i used the canon f/2.5 11.5mm - 138mm almost entirely @ f2.8 for about 3500' feet of film recently. i noticed that there's a significant amount of color fringing around highlights. it only occurs when the backlight is more than 4 stops over. it's not so noticeable in closeups, because your eye is elsewhere; it's more a wide shot where you have a character coming in from a brightly backlit door, say, and the eye is looking carefully at the detail. the lens is really solidly built, and feels great, but i have a feeling that optically there's a better choice out there. the rental house, abel cine tech had an angenieux f/2.1 11.5 - 138 that was out: we were just a student film getting a deal on what was there. my nikon full frame primes (@ f2.8 not wide open) on a digital still camera with a 23mm x 13mm size sensor control CA color fringing better. i also intercut the zoom with a zeiss 16mm T 1.3 used @ f/2.8. the prime controls flare better, controls CA slightly better, and is about the same sharpness. overall the director was very happy with the results and actually enjoyed the lens imperfections.