Hi guys,I am currently using the Canon 60D with the tamron 17-50mm lens.Now I am not sure whether should I get the Canon 10-20 or 22mm(sori,not veri sure) to add to my collection.By using a UWA lens on a crop body,will I be missing some details,etc...Or shd i go for prime lens eg.like the 24mm or even the 35mm?I am more into landscape kinda shot & sometimes wish I could cover all the views but I am still a noob la;anyway...Can the gurus pls kindly show mi the way...Kam Sia!