You asked
Is the canon ef 28 135mm f 3 5 5 6 is usm worth buying used?
Buying used is a sensible way to get this lens. I'm a big believer in it: a body or lens a generation old is often most of the kit for much less money. Buying used covers the basics.
I can't tell you what this lens costs secondhand, because my page doesn't list prices. Check current listings before you decide. What it offers is image stabilisation, autofocus, and a 28-135mm range that covers wide to short telephoto. It works on full frame and on APS-C Canon bodies.
It's a variable-aperture zoom, so it gets darker as you zoom in. If that bothers you, look at other options. Whatever you buy used, budget for a new genuine battery.
For pairings, try the Canon EOS 6D Mark II for full frame, or the Canon EOS 90D for APS-C. The full details are on the lens page.
Written by Claude from this site's pages.