Canon's first wide to tele zoom, the FD 35-70mm f/2.8-3.5 SSC was released only after Canon was satisfied that it rivaled primes in terms of image quality. It was a very expensive lens when new. Canon's nFD 2-ring 35-105mm f/3.5 is an excellent optic, I've found. Probably my favorite zoom in that focal range. The 2-ring Canon FD 80-200mm f/4 zoom is also quite good. When new, it sold for substantially more than the push-pull Canon FD 70-210mm f/4. It can be bought for silly low prices on eBay now, though. And the Canon nFD 80--200mm f/4 L is widely recognized as Canon's best zoom lens. Also, the Canon nFD 50-300mm f/4.5 L still commands lofty prices on the used market, and I can only assume that it does so because it is a great lens (I've never had the opportunity to shoot with one). And then, of course, there's the grand-daddy, the 150-600mm f/5.6 L, which is in a class by itself. Lots of Hollywood movie houses have converted this big lens to work on their 35mm motion picture cameras.