I have a Nikon D3100 entry level DSLR. I have the standard 18-55mm lens, I've been wanting to get another lens for landscape and scenery shots for a while and I wouldn't say I'm clued up with all the different specs and lenses so hoping somebody on here could help. I'm heading to Alaska in a few weeks and will probably be the only time I'll ever go so really desperate for a good lens for the scenery and potential wildlife. Anybody knowledgable with DSLRs and compatible lenses that could point me in the direction of a couple possibilities??