I must admit I had my reservations after reading some of the reviews, but I’ve been more than pleased with the results. Yes, you do need more light because of the f-stop loss and the autofocus does take slightly more time but with good light, the shots are impressive. Pretty darn sharp and the extra reach is exactly what I needed for my bird photography. Definitely worth the buy though I wish it were a little less expensive. All things considered, I’d recommend it if you want extra reach!

I use this Sony - 1.4x Teleconverter with my Sony 70-200mm f/2.8 GM Ver 1 on a Sony A9 and works really well. I believe it stops down to f/4 but still seems to be fast-focusing and sharp with decent light of course. Nice addition to my gear to get that extra reach option when my 150-600mm zoom lens is not at optimal range.

Easy to put on. Can’t wait to take another trip to Europe.

This is a good money saver if you want to increase focal length and have one stop of light to spare. I have this in my bag every time I want to carry less weight in my camera bag and have my longest lens increased 1,4x focal length.

If you do your research on these you will find that many people who review them are not fans. I’m here to tell you they are right! I’ve done my own side by side comparisons and yes the sharpness is compromised. If this doesn’t bother you then get it. If your like me and like sharp photos, I’m not a fan of cropping by I rather crop and it will still look sharper. I’ll be looking to sell this. 1st picture with teleconverter and second picture without. I don’t know if they down size the file here tho. Good luck on your choice!