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Tamron 1.4x Teleconverter

The 1.4X teleconverter will increase the focal length of the master lens by 1.4X and make the lens one f-stop slower. In addition to increasing focal length, both teleconverters allow greater magnification in macro since the Minimum Object Distance (MOD) of the master lens does not change when used with the teleconverters.

I use this teleconverter with my Canon 100-400mm L IS lens as it will make the 400mm into 400x1.4x1.6(crop) = near 900mm !!! Wow!!! It does hunt a bit as you lose a stop of light but on bright sunny day, it's an amazing combo that can't be beat.