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JonoHI There
It does rather depend on your budget. If you're going for the 135, then the f3.4 apo is definitely the choice - otherwise the 90 slim elmarit is as sharp as a pin . . . and is easier to focus than the 135 (and a great deal cheaper too).
I'd guess the 39mm-filter 1974-1990 version:Jono
What is the "slim elmarit" you are referring to? The 39mm filter version or the 46mm version. Both are 2.8 so I am not sure which you mean.
Mark