Best TC for Sony Alpha?
In the past I used a Kenko Teleplus DGX MC4 (1.4x), which I found reasonably satisfactory. I may need to buy a TC this weekend and I was wondering if there's anything better.
I see there's an equivalent Sigma, priced twice as much.
Also, I read that you should not use a TC with a zoom, whose minimal focal length is below, say, 70mm, but I definitely remember I used the Kenko with a 18-50, having no problem at all.
Thanks for all the opinions