Tamron advertises that you will retain autofocus if the master lens is at least f4.5 or faster but I am using this telecoverter with my Sigma 400mm f5.6 for the canon EF mount and my Canon EOS 10s and this combo still retains autofocus. I find that it...

After reading some of the other reviews for this teleconverter, I wanted to add my own experience. Unlike some others, I have been delighted with the Tamron 1.4X converter. I used it with a Nikon 80-200 f2.8D to take a picture a few months ago that won...

I have used many teleconverters in the past, and frankly gave up on 2.0 converters. I found however, the Tamron 1.4 was acceptable when used with a reasonable quality lens.I currently used it on a Tamron XR28-300 and did not notice much degradation in...

I was in the process of switching from Olympus Equipment to Nikon. I could not quite afford a 400mm plus lens so I but a old 300mm f4.5 nikkor and added a Tamron 1.4 converter for when I need extra reach photographing ducks. I was pleasantly suprised...

The Tamron 1.4x TC + 300/4 produced a 420/5.6 with better optical performance than the Tokina 400/5.6 AT-X AF. However, AF was tediously slow. When used with a zoom, even one considered to be good like the 80-200/2.8D, I found that image quality...