As the title suggest I have a bit of a dilemma regarding lenses. I'm planning on going on a trip around summer this year for maybe 2-6 weeks and my photogear is lacking some lenses on the telephotorange. I've got a 5D, 17-40 and a 50mm but no walkaround zoom or telezooms.
My budget is somewhat limited (I have maybe around $500-700 to spend on lenses) so I was thinking of getting a tamron 28-75 2.8 and a teleconverter 2X so I can have both walkaround and a moderate tele if I need it. But I'm thinking 28-75 isn't a big range since I'm wanting to do streetphoto and such, and the Canon EF 28-135 is - from what I've seen - not the best choice for IQ, and the Canon 24-105 is too expensive.
So, what's a good idea? The 28-75 2.8 and a teleconverter or something else?
Thanks in advance.