What lens is best for taking pics of wildlife with my canon dslr 400? also any ideas on lense for landscapes?

For wildlife photography, the best lens you can get would probobly be a 400mm f2.8 lens. A 70-300mm f4.5-5.6 zoom might be a less-expensive alternative, and you might consider using a teleconverter. Theformer will likely set you back a lot of cash, while the latter should be in the $500 range.





For landscapes, I like the 18-105 kit lens that came with my Nikon. I would like an even wider lens, (10-20mm) but that would be really expensive. With landscapes generally, the wider the lens (smaller #'s in mm), the better. With wildlife, the closer you can get with your lens, the better.What lens is best for taking pics of wildlife with my canon dslr 400? also any ideas on lense for landscapes?
wildlife, as in safari?: Tele 300mm or 400mm, preferably with image stabilization





landscapes: wide-angle, or take panorama and stitch them together





don't forget the 1.5x focal length multiplierWhat lens is best for taking pics of wildlife with my canon dslr 400? also any ideas on lense for landscapes?
For wildlife, you'll want to use a telephoto lens. What does your budget look like? The Canon EF 70-300mm f/4-5.6 IS USM is a good choice... unless you have $1500 to spare, in that case you should go with the Canon EF 100-400mm f4.5-5.6L IS USM, but I'm going to assume you don't have that much.





For landscapes, you'll want to use a wide angle lens. The best choice on the XTi would be the Canon EF-S 10-22mm F/3.5-4.5 USM.
You've gotten some good answers already.





Landscapes are best shot with wide angle lenses. If you have the kit lens from your 400, it is moderately wide angle. You can get a little more wide angle if you would like, but in a pinch that will do OK for landscapes.





Wildlife requires a telephoto lens. The consumer oriented lenses aren't bad, and cost much less than the L series (which are tremendous lenses). The 70-300 F4-5.6 IS USM lens is pretty good though expensive.