Canon EF 28-135mm f/3.5-5.6 IS USM

Canon built this as the lens you put on the camera and forget about. It arrived as Canon's first IS in a standard zoom, three years after the EF 75-300mm had introduced stabilization to the EF line in 1995, and it slotted in below the L glass for people who wanted one body-and-lens bundle that could cover a wedding ceremony, the group shot outside, and the candids at the reception. The brief was range plus IS plus a quiet ring-type USM motor, and it hit all three at a price that made it the default kit on EOS film cameras and later the early full-frame DSLRs.

Optics here are a study in priorities, and the priority was reach over perfection. Stopped down to f/8 it is genuinely sharp across the middle of the frame at every focal length, contrasty in a clean modern way, with color that matches the rest of the EF line. Wide open is a different story. At 28mm and f/3.5 the corners go soft and the geometry bows; there is visible barrel distortion at the wide end and pincushion creeping in long. Shoot a brick wall at 28mm and you will see it. Most people never do, because the things this lens points at hide that distortion completely.

The IS is the reason to own it. The early unit buys you roughly two stops, which means you can hand-hold 1/15 at the long end and keep things crisp. That changes how you meter. Indoors, instead of opening to f/3.5 and watching the corners fall apart, you stop down to f/5.6 or f/8 for the sharpness and let the shutter drop into stabilizer territory. Meter for the shadows in Zone Light Meter, place your subject on the value you want, and ride a slow speed the IS can hold. The trade is that f/5.6 at 135mm is dim glass, so in real low light a fast prime still wins.

Bokeh is the honest weakness. With a 6-blade aperture and a slow long end, out-of-focus highlights go hexagonal and the background rendering is busy rather than smooth. This is not a portrait bokeh lens. It is a coverage lens. If you want creamy separation you reach for an 85mm prime, and everyone who shoots this knows it.

Where it sits now is firmly in the bargain bin, and that is its whole appeal. They made millions, so the used market is flooded and prices are low. People cross-shop it against the cheaper EF 28-105mm and the slower 28-90mm kit zooms, and the 28-135 usually wins on build and on that ring USM that snaps to focus fast and silent. On a 72mm thread it also takes screw-in filters happily, so for an ND or a polarizer on a travel kit it stays practical. Nobody calls it a great lens. Plenty of working shooters kept one in the bag for fifteen years anyway, because it does the unglamorous job and does not complain.