billnikon Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont

You CANNOT use a teleconverter on your lens. PERIOD.
If your lens is not listed, and it is not, you cannot use a teleconverter on it.
https://cdn-5.nikon-cdn.com/Assets/Common-Assets/Images/Teleconverter-Compatibility/EN_Comp_chart.html

rehess Loc: South Bend, Indiana, USA

In the field, even a 1.4X can be enormous.
In "PP", even 1.4X is great if you don't want to lose pixels.

rehess Loc: South Bend, Indiana, USA

If a Kenko or other third-party TC doesn't break anything and you can still get enough light, you most certainly can use it.

fetzler Loc: North West PA

Forget it.

billnikon Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont

NO YOU CAN'T. Are you really trying to ruin his lens. Any converter on that lens will hit the rear element.

rehess Loc: South Bend, Indiana, USA

You have tried all converters from all manufacturers??

billnikon Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont

The following is a quote from Kenko.
Full AF operation with the TelePlus MC4 AF 1.4X is possible using camera lenses with open apertures of F4 or brighter. Please be aware that AF will work properly only if there is enough light and contrast on the subject to activate the camera’s AF sensors. (Manual focusing may be necessary when using lenses with smaller open f-stop values than that given above.)

IF, it fits, and that is a big IF. He would only have manual focusing and a very dark screen.
Why would anyone want manual focusing and a dark screen? Especially with sports and wildlife, which is why most folks use longer reach.
And, NO, I have not used ALL teleconverters from ALL manufactures. That is a unreasonable question. I personally do not use teleconverters. There has not been a teleconverter made that IMPROVES image quality.
If you read the original post, the OP was asking about Nikon lenses. And according to Nikon, Nikon does not make a teleconverter for that lens. If Nikon does not offer one, there is probably a good reason for it. I, again, do not recommend using a teleconverter on a slow lens, image degradation of the final image is very possible. Any converter on that lens will also slow auto focus and auto focus initial acquisition slows down to a point where focusing on a fast moving object becomes almost impossible.

rehess Loc: South Bend, Indiana, USA

My experience was that an older Kenko worked on my Canon with an f/4-5.6 lens; it was not too dark, despite what all the nay-sayers said here. The question of 'will it break glass' can be explored carefully and gingerly.

olemikey Loc: 6 mile creek, Spacecoast Florida

Try using the built-in 1.3X crop on your D7100 (in the menu under "Image Area"), It will use the center of the image, best part/sharpest part through the lens. You go from a 24 X 16 to 18 x 12 mm image, drop to approx 15.3 MP, but lose no light in the process. It is a crop, but for a quick change in reach w/o having to change lenses, or adding a T/C, no light loss, so all functions work like they should. I like to fill the frame too, much like the big lens would allow, but if I don't have it with me, or will lose the shot due to the change, I simply push a button and rotate the wheel. A T/C will give a bigger image, but the added glass and light loss usually degrade past the point where a crop will still provide a fine image. Just something to try, that is already available, no cost.
Enjoy.

bthomas42 Loc: North Ridgeville Ohio

Have you thought about using one that fastens to the front of the lens

OviedoPhotos

FWIW, I gave up on TC's a while ago. Either they are not compatible, or the loss in light is too great. I also found with some of them that manipulating them on and off was a pain.

Bultaco Loc: Aiken, SC

Op is using a 55/300.

agillot

lately , there has been members that have posted bird pictures taken with a bridge camera , like top nikon , canon , sony and others , that have a 28 / 600 zoom , 35mm equivalent , and at 600 or near , those pictures look just fine .maybe that would be the way to go ??? .

rehess Loc: South Bend, Indiana, USA

I got lousy results with a them - which is why I went to a rear TC

Architect1776 Loc: In my mind