Lens, lens, lens.

[Anbesol]

I've been contemplating my next lens. I think, what I want will be a fixed angle, within telephoto range, that does especially outstanding portrait work.

I'm inclined to an Minolta 85mm f/1.4 G or a 135mm f/2.8 STF, however, currently already equipped with a 100mm f/2.8 and a 50mm f/1.7, I thought that the addition of the 200mm f/2.8 APO might be a more useful alternative.

Anybody here have any experience with any of these lens? Any strong inclinations that any of you would have towards any of those picks in particular?

Personally, I want the telephoto reach of the 200, the creamy goodness of the STF on the 135, and the bright f/1.4 of the 85.... Choices choices choices...

If I understand the aperture difference in the 135, the "f/2.8" opening really gets translated to an f/4.5 in terms of brightness, so its actually a fairly slow lens. But, is this STF achievable only at f/2.8, or can it be used at narrower apertures? I'm not sure I understand the second diaphragm thing exactly right. *Edit - meaning, is the selected aperture always slowed down by 1.3 stops? Or, does it only slow down for the varied stop value differences between 2.8 (1.3 stops) and 4 (1/3rd stop) and its difference from 4.5?