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I use this on my 70-200mm and my 100-400 for extra reach depending on situation. Works great! Be careful; and heed their warning. The extended part you see on this unit can break you camera sensor it you accidentally try to put it on backwards. Great tight fit and does the job as expected.
I purchased this converter to compliment my telephoto lens and it is ideal for application. I am very pleased with purchase.
Im sure its a great teleconverter, just will not fit on the 70-200mm could not find anywhere that states that.
I use the 1.4X teleconverter primarily with a 70-200/2.8. The autofocus is as fast as using the lens natively and the images are sharp.
I think I had a bad copy my pictures are soft and most shot are out of focused.
Great addition to 100-400 G Master, adds reach at small aperture loss.
Great Picture Quality
1.4 performing satisfactory for my needs. Used to 300 mm, this produces 280mm which is close, using my 70-200 2.8 Sony lens.Don't find any negative aspects so far.
Unobtrusive, easy to use. Excellent resolution on recent moon shots. Only loose a stop, but does limit to f8 at full 400mm zoom.
Pros: small, light weight, optically very sharp, even packaged beautifullyCons: expensive
I am giving this 5 stars for being small, and working as well as I might hope on my Sony 100-400mm GM lens. Focus is slightly affected, as is image quality (mostly because it is 1 stop slower, as physics would dictate...), but these affects are expected. This is as good as tele-converters get.