Clive,
When I set up for with and without 2 x teleconverter shots in Robs TC Musings thread, I found my 28-105 zoom outperformed the older fixed focal at distances less than 15 ft. By 20 ft the prime wins. So I guess there are instances where some lenses will perform better at close distances.
Have you considered a fixed focal 85mm f1.8. As these were always favoured for portraiture I would guess the performance at 1.5mtrs would be very good.
Don
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