Canon DSLR camera - what level of zoom?
I'll be traveling to Australia/NZ in March. I love taking pictures on my Canon DSLR and making Shutterfly photo books afterwards. I do not like bringing 2 lenses along - one for 18mm to 135 mm and one for 70 mm to 300 mm. When we did Tauck's safari to Kenya I was constantly switching lenses and it was worth all the effort. When we did Tauck's Blue Danube and Tauck's Israel/Jordan, I mostly only needed the standard 18-135mm lens. For those that have been on this trip and like taking lots of pictures, do you have any recommendations on whether a zoom lens really is needed? I am debating buying Tamron's new all-in-one 18 to 400 mm lens, but it is big $$$, and I'm not sure if it is needed for this trip. Any advice?