Hi- I'm new to the forum, have used a Sony Alpha 100 for years and finally upgraded to a Canon 7D. I got the 7D instead of the 5D so I could put more money into lenses and got an EFS 17-55 2.8 IS USM and an EF 70-200 F2.8L IS II USM. Delightful as they are, the 70-200 is just too heavy to lug around on a hike. I'd like to get a walking around lens and can't decide if I'd be better off getting a Tamron 18-270 f3.5-6.3 Di II VCLD or a 70-300 f4-5.6 DIVC USD AF. The 18-270 would mean having to take only one lens and would lessen the chance of getting dust in the camera during lens changes. On the other hand, the Canon 17-55 takes great photos and isn't THAT heavy, so I could get the 70-300, have a bit more range, and save some money. I mainly use my camera for family photos, vacations, landscapes and wildlife. Any comments or suggestions? Has anyone used either of the Tamron lenses? Also, I can navigate the rest of the forum, but when I click on links in the beginner's forum, nothing happens. Some of the tutorials look wonderful. Any idea what's wrong?