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Yeah, most likely your lens is stopped down.
Are you getting diffraction spikes on the brights stars, such as Antares? That would be a giveaway.
On Canon lenses, if you wish to stop them down (they're natively wide open, as Simon wrote), you close down to the desired aperture, press the depth-of-field preview button, then, take the lens off the camera. It will then be stuck at whatever aperture was chosen.
It's perfectly safe to do it on Canon lenses, but, I don't know anything about Nikon.
H
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