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@Liquidstone, AT280 gets high marks for resolution, being close to diffraction-limited wide open. The published MTF is quite impressive and distortion stays under 1%. Not bad for 7 elements in 1993, although the latest Canikon 20-element monsters with fluorite should be performing similarly (with AF and IS). At a certain point, lens designers are trading one technical deficiency for another: weight, bokeh, field flatness, vignetting, CA, manufacturing variation, serviceability. We consumers have to pick something that seems to do the job and, as you know, there are plenty of fine telephoto options. Most of them are mainsteam and, if exotic, are exotic only in price!
Oddly, my favorite tele these days is the Rokinon 135/2: ridiculously cheap at $400 or so, insane optical performance, FL more applicable to studio. Hard to call it exotic, though.
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