I would like to purchase a 2x teleconverter for my T3 with 18-55 & 55-250 IS & AF EFS lenses. I've located a Kenko Teleplus Pro 300 DGX. Can anyone tell me about this lens? Pros & cons. Will it even work on my camera with these lenses? If not can someone recomend one that will work. I would like to keep the price under or close to $300 if possible. I am not a pro and don't require super great peformance but would like to be able to get fairly good pics.