cambriaman Loc: Central CA Coast

Sorry to see that you are disappointed with the performance. But, the comments posted in reply explain why it is better to save the money you would spend on an extender and eventually get the prime or zoom lens that gives you the reach you want. I have formed this opinion after reading poster's comments for the past 3 years.

cjc2 Loc: Hellertown PA

On the contrary, many experienced photographers use a 1.4X TC regularly, including me. As a sports action guy, I like the 400/2.8 because the 500 and 600 do not come as a 2.8. When I want the reach, and can afford it light wise, I use the 1.4X TC. For night games I use just the lens. I get the best of both worlds by buying only one expensive lens. If I was working for one of the big guys, who would pay for my lenses for me I'd have all three, and probably the neww 800 as well! Very rarely do I use the 2X, but I do use it on occasion. Best of luck

MikieLBS Loc: "Southeast of Disorder"

This is the compatibility chart. Read it carefully. It is not good news. I believe I also read you were using a d7000. It is not F8 compatible. See the note on bottom of page about compatible cameras.

http://cdn-5.nikon-cdn.com/Assets/Common-Assets/Images/Teleconverter-Compatibility/EN_Comp_chart.html

mcveed Loc: Kelowna, British Columbia (between trips)

The D7000 is f5.6 compatible, and that's all it needs to use an f2.8 lens with a TC-20E III. I just looked at the chart you linked to. Funny but this chart, on the TC-20E III doesn't say the same thing.
http://imaging.nikon.com/lineup/lens/teleconverters/af-s_tc-20e_3/

Apaflo Loc: Anchorage, Alaska

Not significant for the OP, who is using a 70-200mm f/2.8G VRII lens. Coupled with a 2X TC the maximum aperture is f/5.6. Every DSLR Nikon has ever made will auto focus with that combination.

cjc2 Loc: Hellertown PA

Except response will be affected.

Apaflo Loc: Anchorage, Alaska

Of course, and that is not being incorrectly denied. There are many characteristics, such as sharpness, chroma fringing, spherical aberrations and so on that will degrade when using a TC, but claiming the camera body needs to be AF functional at f/8 is false. My point was lets keep the information accurate.

cjc2 Loc: Hellertown PA

Which IS significant! It's also something often forgotten.

Apaflo Loc: Anchorage, Alaska

Not posting inaccurate information is the most significant. Posting every little detail that is true is not.

cjc2 Loc: Hellertown PA

Loss of focus speed is indeed not a 'little detail' and was part of the op.

Apaflo Loc: Anchorage, Alaska

But you followed up to my post, not the OP. Insignificant in the context posted...

Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)

Here is a pretty comprehensive review, including test results, sample shots, and lens comparisons - and a few words about using it with the 1.4x, 1.7x and 2.0x TCs. This guy does great reviews, and actually provides sample images to support his presentation of the facts and impressions

https://photographylife.com/reviews/nikon-70-200mm-f2-8g-vr-ii/

cjc2 Loc: Hellertown PA

Yes I did follow up on your post, but I also considered the OP. Normally, your answers are very complete pontifications on the subject at hand, and, for one who is not knowledgeable on the particular subject, can be very useful. I believe that loss of autofocus speed, on any lens with any TC, is important and can be very important subject dependent. I was not criticizing you, I was just adding something that I consider important, considering that I shoot mostly action sports. Personally, I only use a TC on my 400/2.8, and the ones I own are specifically suited to that lens. I do also own a Sigma Sport 150-600, which I bought for personal use, but I would never consider using a TC on that as focus speed is slow enough at 5.6 to begin with. While someday I might want to play with a TC on the Sigma as I suspect my D5 might work with it in bright light, I would also expect the autofocus the be terribly slow if it worked at all. Bottom line, focus speed is a consideration when using any TC on any lens, and that was, and is my point. It represents my opinion and that's all! Best of luck.

genesampson

Thanks for posting the Nikon listing. I have a TC1.4 III and the 80-400 so am glad to see it is compatible with the D7200 I just ordered. Wasn't able to find the table for a while.

MikieLBS Loc: "Southeast of Disorder"