Recently I took approximately 100 pictures of birds and small animals. I used Sony FE 2.0 Teleconverter with my SEL100400GM and Sony A7RII. It was a perfect match. I did not notice any significant auto/manual focus or sharpness issues.

I got this to add to my Sony 400mm f2.8. It's a perfect fit. The lens still focuses quickly and before you know it you have an 800mm f5.6. You can program a button to go to crop sensor and then you have an image that looks even closer.

After reading the mediocre reviews for the SEL16F28, I ended up trying this lens (SEL20F28). The lens has proved to be very handy, and I am generally happy with the photos. The photos are sharp, but low light scenes may be a little dark with some vignetting. Two jpeg photos are uploaded for review.

This tele works wonderfully with my 70-200 2.8 G. With the little bit of testing that I've done, there doesn't seem to be much (if any) image degradation caused by using this multiplier.

Consistent Output; Durable; Lightweight; Rugged; Strong Construction

Very easy to use for photography and video. Works very well outdoors in a landscape setting. In this context I would give it 5stars. Interior shots where space is tight, it was more limited in scope than the standard lens supplied with the Sony a5100.

Bought this for with my 70 to 200mm G Master - works a tear.

So far I am really pleased with this lens and the service by the seller

I love it

Perfect extension of my eyes

Bought this for with my 70 to 200mm G Master - works a tear.

Since 6 months now, I am using this teleconverter with the G Master FE 100-400mm super-telephoto zoom lens (SEL100400GM), mostly for wildlife photography. Converting that lens to 200-800mm range, it allows me to get close-up shots of small birds and animals that are quite far away.