I haven't tried it with the Tamron. I just felt once I got the 150-600 an extender for my 70-200 wasn't needed.
gwong1 wrote:
Steve, I had a similar issue with the Canon 1.4 and 2.0 extenders and the Tamron 150-600. I purchased the Kenko 1.4 abd 2.0 Pro 300 DGX models and they work very well. They also stack, which the Canon's would not do. If you are concerned with quality, look at my posts and Brucew29 posts under astrophotography, we both use a similar set-up and stack the 1.4 and 2.0. Gary