02-07-2016, 01:32 PM
IMHO 17-55 range is by far more useful in landscape than 10-18, since I shifted full frame I see myself rarely using my 16-28 for landscape however it does wonders for street photography, architecture, and parties, if you are doing landscape at f8 IMHO anything will work, you don't need any upgrade since you won't be seeing any difference on the final prints, I am printing a lot of A4 landscape, on the final print, it is merely impossible to say which one was taken with the crappy 18-55 on 300D and which one is taken with 24-105L on 5D.