They are selling like hotcakes here. I wish I had a dozen of themI just gave one away that I couldn't sell. In fact, I gave an entire AE1-P kit away with half a dozen lenses.
All the zoom lenses listed are not constant aperture and can cause severe exposure problems if used with flash or a hand held light meter ,the Canon FD 28 - 85 is a constant f4 aperture and in my experience of owning one for more than 25 years is opticaly excellent and because of it's poymar barrel is much lighter than many other metal barreled zoom lenses of the same focal length. Your assumption that this lens is opticaly inferior to the lenses you mentioned could be right but isn't very credible because it's pure prejudice because you probably never used one.I have a few favorite wides that work with the AE-1 -- or any FD Canon, really. The one I've probably used the most, and just simply a great lens, is the Vivitar Series 1 28-90mm f/2.8-3.5. It's a varifocal lens (you have to refocus after zooming), but I found that I got used to that pretty quick. I shot mostly slides with it back in the day and had many excellent results. Back then, my FD cameras of choice were the original F-1 and FTb. I didn't care for my AE-1's metering pattern, so it didn't get as much use. Late in its production of S1 lenses, Vivitar came out with a replacement for the 28-90, a 28-105/2.8-3.8. Made by Cosina, it was a good lens, but it wasn't as good as the original. (I own both and I still prefer the 28-90)
Other lenses worth considering are Tamrons. The SP 28-80/3.5-4.2 is a good equivalent of the Vivitar 28-90. Tamron also produced a SP 28-135/4-4.5, a stop slower than the Vivitar, but with the extra range, is often worth it. And Tamron produced a SP 24-48/3.5-3.8, which is very compact, and very useful because of its 24mm setting.
Tokina built an ATX 28-85/3.5-4.5, which generally gets high marks. ATX lenses with red rings have SD (low dispersion) glass, which can be a plus, but I see no red ring on photos of this lens.
The Canon 28-85 is a very late FD production, not nearly as robust as the above lenses, and if I had to wager, I'd bet not as good.
All the zoom lenses listed are not constant aperture and can cause severe exposure problems if used with flash or a hand held light meter.
+1Out of those 4 lenses 3 lenses have a variation of 1/2 half stop or less. One lens varies slightly more than 1/2 stop. I would not call that severe.
That's true, but I shoot mainly slide film and when buying lenses never saw any point in making myself potential problems.+1
It even remains to be seen that the actual F-stop is not equal to that indicated on the f-stop ring at the present focal length. And 1/2 stop would not only be tolerable, but go un-noticed, unless one would be shooting slide film.
I would be more concerned, with any zoom (many elements) by the difference between F-number and T-number. That problem is hidden as long as one uses TTL metering (except the shutter time is longer to make up for lost transmission) but indeed can cause exposure errors when using an external meter. That goes for any complex zoom, whether constant aperture or not. And, I'm not making that up, I've stumbled upon it during a post-overhaul check of a zoom.
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