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Paul,
sorry just re-read what I said, and maybe I should have suggested "L" series PRIME lenses. I have always shunned zooms, old school sorry. OK, maybe the L series zooms, but at worst maybe a couple of battered (read Cheaper) primes, 85mm and 200mm. Thease are normally f2.8 or better, and sharper than a shower of $^%@.
JD is using a Sigma f2.8 zoom, and I too have used a Nikon 80 - -200 F2.8 zoom. Both were OK, but again I like primes.
The Ultrasonic part I believe is just the focussing system.
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