Hi Everyone...
First and foremost, thank you for taking time to read my thread and, hopefully, give me some input in my future purchase... Here's a quick synopsis:
- I recently purchased the Rebel XTi
- I have about $650 budget to get a new zoom lens
- I have an old Quantaray 70-300mm f/4-5.6 zoom lens (used on my film SLR)
- Primary use of the Quantaray lens was for telephoto closeups (ppl & objects)
The lenses I would like to consider and is roughly in my price range is as follows (and in no particular order):
- Canon EF 70-200mm f/4L USM (~$580)
- Canon EF 70-300mm f/4-5.6 IS USM (~$560)
- Tamron AF 28-300mm f/3.5-6.3 XR Di LD (~400)
- Sigma 18-200mm f3.5-6.3 DC (~$390)
All are above average lenses (by means of quality and build), but I have no way of "renting" any of the lenses. That's why I request input from my fellow photographers in this forum...
In addition, I'm also contemplating adding the Kenko 2.0x Pro Teleconverter Extension Tubes to double the range (if & when I need that extra reach)... Would anyone know which lens would give better results with the Kenko attachment?
Again, thank you all for any input, comment, and/or concern in my decision making. I appreciate the help all of you give... Thanks again!
- airbutchie 
The 70-200 f/4L is by far the sharpest lens in that range. Very tough lens to beat unless you spend a lot more.

