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To get a really nice wide lens for landscape I would suggest the Canon EF-S 10-22mm f/3.5-4.5 USM. You are using a body with a crop sensor, so you need to consider that your actual lens focal length would be mm x 1.6 so at 10mm its the equivalent to 16mm on a full frame sensor, or 35mm camera on film. I have the 10-22 and find it nice and sharp and has a ...

If you want one lens for those purposes you can't use a prime, but Canon EF-S 17-55mm f/2.8 IS USM would be a good option. Then you have the wide end for landscapes, and can take portraits with 55mm. Portraits on a crop sensor looks best from 60-90mm, so 55mm gets pretty close. And it is a fixed aperture zoom. While not being quite as open as the 1.8 primes, ...

You've really got some competing needs there. Portraits typically call for a normal to short-tele lens -- starting at 50mm or so (full-frame) or 35mm (crop). Landscapes and star photography tend to lean toward wider lenses, and on the crop-sensor T3i, you'd want to be at least as wide as the 28. As a point of reference, Canon's 10-22mm lens is generally ...