That adapter only works with DS (digiscoping) series Fieldscope eyepieces. Those have a groove built into the eyepiece body that allows you to slip the adapter onto the body. Won't work with the non-DS series eyepieces and definitely not the zoom. As usual, Nikon is a bit less than clear on this. The info is buried down in the fine print. Nikon uses the word universal, here, rather liberally.
If you want to use that adapter, getting a DS series eyepiece IS a good move in terms of digiscoping, definitely better than using the zoom which will give you vignetting no matter what adapter you use. Going fixed power with a DS is the only way to go for digiscoping on a Fieldscope . Otherwise, just return that adapter and go with an aftermarket universal, such as the Alpen 706 or similar to use with the zoom.
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