Question 1

will this work on the godox V860ii-s speedlight?

Accepted Answer

Yes, it will work - but I had to take a sharp knife and whittle away at the inside rim of the plastic to enlarge it just enough to get it onto the Godox flash. It still requires a bit of work to get the plastic diffuser onto the flash, so I'm probably going to have to whittle a bit more. I might try using a metal file this time. When the diffuser is finally worked back and forth to get onto the flash, though, it works quite well in diffusing the light. And the Godox works really well in TTL mode with my Fuji X-H1.

Question 2

Will these fit on a Neewer TT560 speedlight?

Accepted Answer

Yes

Question 3

Will these fit on the Nikon SB700?

Accepted Answer

I just posted the Inner dimensions of the diffuser so look in the Q&A. Just measure your flash head and then you will know. FYI the diffuser has a little flexibility so it can mold to your head.

Question 4

Does this diffuse a full stop? Is it a "one stop diffuser"? Thank you.

Accepted Answer

Your question is a little strange. I have never seen a diffuser rated by the amount it restricts light. A diffuser spreads the flashes light making it softer and less directional.  The manufacturer claims  99% light transmittance. It increases your flash by 200%.
so only one percent of your flashes light is lost with the diffuser. I guess you could figure out how many stops that is but it would depend on what power setting your flash is set to. So if your flash is at 1/64th power or 1/2 power makes a lot of difference. 
I think you might be confused about a diffuser's purpose and its effects on a flashes output.

ASIN	B07GYMSRJ7
Best Sellers Rank	#23 in Camera Flash Light Diffusers
Customer Reviews	4.4 4.4 out of 5 stars (1,042)
Date First Available	August 30, 2018
Is Discontinued By Manufacturer	No
Item Weight	3.2 ounces
Manufacturer	GODOX
Product Dimensions	5.12 x 3.15 x 3.54 inches

Flash Diffuser for Speedlight [3-Pack], Compatible with Canon 560 565EX 580EX and with Godox V860 TT600 - Speedlight, Camera Flash, Compatible with Canon and Godox Flash Diffuser

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