Here's the thing though. I have the original 28-105mm f3.5-4.5 USM with the metal mount, and I have zero issues with it stopped down to f8/f11/f16 where I do the majority of my photography.
Surprise!
That lens you quoted, the 28-105mm, was supplied with my EOS1N free as a starter lens with the camera, as the price for the 1N at the time ($3,990 and $740 for the power drive booster E1) did
not include a lens: she, the sales girl, took pity on me emptying the bank, and it was a very nice gesture. And I do know that lens was a very good performer in many situations because my first Ilfochrome Classic prints were made with it! I still have the exposure record somewhere of that particular photograph, and would have used f11 by default (and this Av remains today a default go-to for a lot of imaging). There is a simple, serpentine waterfall print on the wall here [photo below] that I see all the time, every day, and have so since 1995 when it was first made. With. that. lens.
The other EF lens I bought about a year after the 1N (duty free on a trip to the South Pacific) is the 20mm — I still have this, and it is still in mint condition and used as a standby for a faster wide angle than the L-series 17-40mm f4L. Toward the beginning of 1996 came the heavy investment in L-series lenses. I have not bought nor disposed of any because I consider them a good investment, to say nothing of being solid, reliable performers.
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Image shot with EOS 1N+EF 28-105 (w/ CPOL), RVP50. April 1995, Ilfochrome Classic print.
(I had to shoot this framed print at a silly angle to avoid reflections from the glass/print!
)
