Works fine when it's on. Falls off very easy.
Glad I was able to find a replacement at a good cost so i picked up two just in case.
This is the 3rd eyepiece I've purchased because they are easily lost. This one became detached & lost within a week. This product has not been thoroughly tested by Nikon. It does not adhere well to the camera body & must be taken off & replaced with an eyepiece cap when self-timed exposures are taken to avoid false exposure readings. The more one has to remove the rubber eyepiece the less it adheres & consequently falls off during camera use.