As usual, I am turning to my fellow Hogs with a question. Please excuse me if this sounds stupid, but I just need to make sure there are no flaws in my logic.

I am considering purchasing the Nikon AF-S Teleconverter 14EIII for use with my Nikon 80-400 (newer model!) mounted on my Nikon D7200. If I am looking at this correctly, the 1.4 teleconverter on the 80-400 mounted on the D7200 (a cropped sensor Nikon with a 1.5 multiplier) would give me a reach of 168-840mm (80 x 1.5 x 1.4) to 840 (400 x 1.5 x 1.4). Is my reasoning on this correct? If not, where did I go wrong and what IS correct?

If anyone here has actual experience with using this combination and would like to share, please feel free.

I have already checked the Nikon compatability charts and determined that the 14EIII will work on my version of the 80-400 mounted on the D7200. I can live with the loss of 1 f stop in this situation.

We are heading out on another one of our adventures and I have a VERY strict carry-on weight limit. If my reasoning is correct, I will be able to leave my Tamron 150-600mm (total weight with case, hood, collarof over 5 pounds) behind. If my reasoning is sound, I would be able to achieve almost the same 900mm effective range with the 80-400mm 1.4 teleconverter with only a bit over 1/2 pound additional weight.

Many thanks,
"Mike"

As usual, I am turning to my fellow Hogs with a question. Please excuse me if this sounds stupid, but I just need to make sure there are no flaws in my logic.

I am considering purchasing the Nikon AF-S Teleconverter 14EIII for use with my Nikon 80-400 (newer model!) mounted on my Nikon D7200. If I am looking at this correctly, the 1.4 teleconverter on the 80-400 mounted on the D7200 (a cropped sensor Nikon with a 1.5 multiplier) would give me a reach of 168-840mm (80 x 1.5 x 1.4) to 840 (400 x 1.5 x 1.4). Is my reasoning on this correct? If not, where did I go wrong and what IS correct?

If anyone here has actual experience with using this combination and would like to share, please feel free.

I have already checked the Nikon compatability charts and determined that the 14EIII will work on my version of the 80-400 mounted on the D7200. I can live with the loss of 1 f stop in this situation.

We are heading out on another one of our adventures and I have a VERY strict carry-on weight limit. If my reasoning is correct, I will be able to leave my Tamron 150-600mm (total weight with case, hood, collarof over 5 pounds) behind. I would be able to achieve almost the same 900mm effective range with the 80-400mm 1.4 teleconverter with only a bit over 1/2 pound additional weight.

Many thanks,
"Mike"

As usual, I am turning to my fellow Hogs with a question. Please excuse me if this sounds stupid, but I just need to make sure there are no flaws in my logic.

I am considering purchasing the Nikon AF-S Teleconverter 14EIII for use with my Nikon 80-400 (newer model!) mounted on my Nikon D7200. If I am looking at this correctly, the 1.4 teleconverter on the 80-400 mounted on the D7200 (a cropped sensor Nikon with a 1.5 multiplier) would give me a reach of 168-840mm (80 x 1.5 x 1.4) to 840 (400 x 1.5 x 1.4). Is my reasoning on this correct? If not, where did I go wrong and what IS correct?

If anyone here has actual experience with using this combination and would like to share, please feel free.

I have already checked the Nikon compatability charts and determined that the 14EIII will work on my version of the 80-400 mounted on the D7200. I can live with the loss of 1 f stop in this situation.

We are heading out on another one of our adventures and I have a VERY strict carry-on weight limit. If my reasoning is correct, I will be able to leave my Tamron 150-600mm (total weight with case, hood, collarof over 5 pounds) behind. I would be able to achieve almost the same 900mm effective range with the 80-400mm 1.4 teleconverter with only a bit over 1/2 pound additional weight.

Many thanks,
"Mike"

It should work fine. I use my 80-400 (older version) and it works fine without the 1.4 teleconverter. With the additional 1.4 of the tele, and the "apparent" of the crop sensor, you should have a good combination. AND, you can always take off the converter and use the lens straight up. The 1 stop loss on that lens is workable (you can always increase you ISO to make up). The f/4.5 to f/40 is a little slow but certainly workable. You definitely want to take a tripod. My 80-400 has the Kirk tripod mount which replaces the Nikon one and (supposedly) gives it better balance as the mount extends from the same mount point on the camera but the foot is longer and moves the tripod mount hole further forward to offset the weight of the camera body. (I got lucky and got mine for $350 at KEF, used of course. Mine requires the focus motor in the camera and is slower to focus). Its a great lens and you will probably love the tele too.

As usual, I am turning to my fellow Hogs with a question. Please excuse me if this sounds stupid, but I just need to make sure there are no flaws in my logic.

I am considering purchasing the Nikon AF-S Teleconverter 14EIII for use with my Nikon 80-400 (newer model!) mounted on my Nikon D7200. If I am looking at this correctly, the 1.4 teleconverter on the 80-400 mounted on the D7200 (a cropped sensor Nikon with a 1.5 multiplier) would give me a reach of 168-840mm (80 x 1.5 x 1.4) to 840 (400 x 1.5 x 1.4). Is my reasoning on this correct? If not, where did I go wrong and what IS correct?

If anyone here has actual experience with using this combination and would like to share, please feel free.

I have already checked the Nikon compatability charts and determined that the 14EIII will work on my version of the 80-400 mounted on the D7200. I can live with the loss of 1 f stop in this situation.

We are heading out on another one of our adventures and I have a VERY strict carry-on weight limit. If my reasoning is correct, I will be able to leave my Tamron 150-600mm (total weight with case, hood, collarof over 5 pounds) behind. I would be able to achieve almost the same 900mm effective range with the 80-400mm 1.4 teleconverter with only a bit over 1/2 pound additional weight.

Many thanks,
"Mike"

Take a look at the comparisons made on this review:

https://photographylife.com/reviews/nikon-200-500mm-f5-6e-vr/3

Particularly at the bottom of the page where it states: "Here, the 80-400mm seems to be doing a little better in terms of overall sharpness. However, there are two important points to keep in mind. As stated earlier, the 1.4x teleconverter reduces AF speed and accuracy pretty drastically on the 80-400mm, making the combo not so usable in the field." When you add a TC to an already slow lens - everything suffers.

I am not sure why you would have to bring the case for the Tamron. Without the case, the Tamron is only 1/3 lb heavier than the 80-400 with TC. I would be inclined to bring the Tamron. At least the AF will be nice and snappy, and the image quality will be ok.

FWIW, my LowePro ProTrekker 450AW holds my Sigma 150-600 sport, with body attached, along with another body, and six more lenses. Maybe you need a slightly bigger bag to avoid taking the Tamron's bag.

As usual, I am turning to my fellow Hogs with a question. Please excuse me if this sounds stupid, but I just need to make sure there are no flaws in my logic.

I am considering purchasing the Nikon AF-S Teleconverter 14EIII for use with my Nikon 80-400 (newer model!) mounted on my Nikon D7200. If I am looking at this correctly, the 1.4 teleconverter on the 80-400 mounted on the D7200 (a cropped sensor Nikon with a 1.5 multiplier) would give me a reach of 168-840mm (80 x 1.5 x 1.4) to 840 (400 x 1.5 x 1.4). Is my reasoning on this correct? If not, where did I go wrong and what IS correct?

If anyone here has actual experience with using this combination and would like to share, please feel free.

I have already checked the Nikon compatability charts and determined that the 14EIII will work on my version of the 80-400 mounted on the D7200. I can live with the loss of 1 f stop in this situation.

We are heading out on another one of our adventures and I have a VERY strict carry-on weight limit. If my reasoning is correct, I will be able to leave my Tamron 150-600mm (total weight with case, hood, collarof over 5 pounds) behind. I would be able to achieve almost the same 900mm effective range with the 80-400mm 1.4 teleconverter with only a bit over 1/2 pound additional weight.

Many thanks,
"Mike"

Please read a post I made in December called:
Roosevelt Elk, lens tuning lesson
I used a 600mm F4 prime on my crop sensor D500 and a 1.4x TC, but your math is correct. Pay attention to my lesson as the lens NEEDS to be tuned to the camera both with and without the TC. Long telephoto result in very shallow DOF so proper tuning is much more critically important than with wide angle lenses.
Also keep in mind an 80-400 is already F5.6 at 400mm so the 1.4x will make it an F8 where the Tamron is F6.3 from 480 to 600 (only 1/3 stop slower) meaning it will focus faster and more accurately. How critical is that 1/2 pound when you weigh it against the risk of missing shots?
As a general rule I always avoid recommending a TC with ANY variable aperture lens, it's just never a good idea.

Thank you so much for your response, Carter. I did not approach the f stop loss the way that you did. Your approach and explanation definitely helped me.

You have given me a different way to attack this problem. I am now re-thinking my approach. It now seems that I would be better off leaving the 80-400 behind and taking the 150-600. The tuning issue with the tele and the 80-400 gives me pause and concern. Don't know if I'm comfortable (or knowledgable enough)doing that. I will definitely look at the your post about the elk. My 150-600 works well on both my D5200 and my D7200. Guess what I'm saying is "if it ain't broke, don't fix it!".

Thanks for sharing your knowledge and expertise so generously.