On my crop sony i have the 18-55 + 55-200 i very rarely use the wide end but have done when needed, one of the things I thought was would I miss it should I get the 24-105. the 18-135 is f3.5/5.6 and I would like a constant apature. i could get the canon 17-55 f2.8 but it is more exspensive...