sharrysas wrote:Hi,
I have checked several 1.4x and 2x teleconverters but from what I can understand they are not recommended for all lenses.
So my question is does anyone on here with a tamron 18-270 lense tried using a teleconverter and if so which one and what are the results like.
Teleconverters are recommended for use on lenses of 100mm & above only. There's a few reasons...
1. They're optical properties are tuned toward the longer side, and will probably increase distortions at wide angle.
2. Wide angle lens elements may protrude too far back, and could possibly contact the converter causing damage.
3. The light needed for auto-focus with slower lenses isn't enough, and might cause focus error and possible camera lock up.
Some converters such as Canon, and Sigma are actually quoted as only working with specific lenses of f/2.8 or less.
Hope this helps answer.