I brought with me the following:
- Sony Alpha A700 DSLR
- Sony 70-400/G ssm lens
- Tamron 17-50 lens
After talking a bit, explaining that the 70-400 was a pretty good lens, and that I was able to rent it from BorrowedLenses.com, I decided to do a test: I took the 70-400 off of my A700, mounted it on their A580, and took some test shots.