Skip Williams , Aug 31, 2005; 08:59 p.m.
I had a 75-150 many years ago and never really liked it. The performance was OK, but it was definitely an early 70's zoom with all their warts, IMO. Don't expect anything special, but it probably was the equal of most of it's competition. It will deliver fine images, especially at f/8 or so. F/4 will be softer.
I'm surprised that you didn't like the 35-70/3.5-4.5. I've gotten great shots with mine. That's the real, real small lens, right? Did you mean the f/3.5-4.8? If so, that lens was definitely mediocre, IME. I'm pretty sure it was a Cosina re-badge.
The 35-70/3.6 is a high-quality lens, just below the 35-80/2.8 in quality. It's also very well built.