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Originally Posted by adan
OTOH the Super-wide TE has a range of only 1.31x. Plus, it looks (from its length) like it may be a rather telecentric, digital friendly design. It may well be that the various optical effects (corner cyans, vignetting etc.) are essentially the same over this very limited range, so that one profile will handle all three focal lengths.
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I can certainly imagine that controlling vignetting was uppermost in their minds when designing the lens so, as you say, they may have gone for telecentric. It is certainly quite a long lens. It may well be that the design and the limited "zoom" range meant they did not need to differentiate between focal lengths.
That was before 486s came into their world and as Seans results show, there is a big difference between a 28 and a 21 so that moving from 21 to 16 will be worse still. I'm also wondering whether correction is possible at extreme wide-angles. It may be that the effect is non-linear with angle, like a trig tan function, for example.
Has anyone tried a filter held in front of the CV 15 (no way of mounting it of course)?