Had the same problem - the manuals says that this means that no lens exists!
I detached and re-attached the lens and it fixed the problem temporarily - I've only had the camera for a very short time - not happy with this as my previous camera - a D70 never caused *ANY* problems
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Looking at the information on the camera it does not look like the lens can be detached from the camera body and Bushnell only makes a camera adapter for their spotting scopes so unfortunately you seem to be out of luck.
If you wish to pursue astrophotography you should consider a higher quality scope. In the mean time you could use the camera in a smart phone to take pictures although that can be a little tricky.
If the lens has the electronics to communicate with the camera, try cleaning the electrical contacts on the back of the lens and in the lens mount on the camera body. If the lens doesn't have the electronics to communicate with the camera, set the camera to manual (turn the mode dial to M) and set the exposure manually.
If you're not sure whether the lens has the electronics or not, tell us what the lens is.
Flashing "F--" means the camera is not recognizing the lens or a non CPU lens is attached. Try manual mode. Taake battery out of camera, remove lends and clean electrical contacts on lens and camera body with moistened swab, Put back together. Remove battery with camera "ON" and hold down shutter button for about 30 seconds. Put battery back in and turn on. Then Press hardware reset button on camera bottom.
Hi mmarushack, in the manual page 132 it states that the F- - error means the lens is not attached or a non CPU lens is attached. If a older non CPU lens is attached select M mode. That would be on the right side of the lens mount as you face the front of the camera. The assumption is you have a CPU lens then I would suggest doing a reset of the camera. Open the terminal rubber flap on the left side of the camera. Just below the USB connector is a small push button. That resets the camera thus fixes you camera. If not do call Nikon at 800-645-6689
What lens do you have attached? A flashing F-- indicates the camera and lens are not communicating. This can happen for several reasons:
1. There is no lens attached. Attach a lens.
2. There is a lens attached, but it's what Nikon calls a non-CPU lens. The lens lacks the electrical contacts to communicate with the camera. Set the exposure mode to Manual (M) and adjust the aperture using the aperture ring on the lens. You won't get any metering assistance from the camera's built-in meter.
3. There is a CPU lens attached. Remove the lens, clean the contacts both on the lens and the mount, then reattach the lens. If that doesn't solve it, then either the lens or the camera (or both) need service.