[Brightcolours]

Nikon F-mount = Nikon F-mount. Only with G lenses you need a different adapter to operate the aperture, G lenses do not have an aperture ring. And with the new E mount lenses you would be stuffed, as there is no way to operate their electronic aperture mechanism (but those are only some of the newest AF lenses and the tilt/shift range).

I do want to point out that with adapted lenses, older and this Samyang, that you need to close down the aperture yourself via the lens' aperture ring. With "normal" lenses, you look through the wide open lens regardless of what aperture you set on the camera, and only during exposure the aperture of the lens gets closed. With adapted lenses (and the cheap Samyang EF range) you focus wide open, then close the aperture via the lens ring to wanted aperture (I usually count the clicks to know what aperture I am setting, if I want to close down), now the camera meters correctly with the closed down aperture, and you take the image.

So, extra things/steps to do/take, besides manual focussing.

I would avoid the 1st adapter you show, as it has quite a large compatibility possibility with the 7D mk II, the 2nd one might be fine.