Question about Nikon D90 Digital Camera with 18-105mm lens

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Flashing F - -

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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  • kakima May 11, 2010

    Try cleaning the contacts on the lens and the body and see if that helps.

  • kakima Feb 07, 2012

    Having gone over a year without a response to my query, I assume cleaning the lens contacts solved the problem.



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Having gone over a year without a response to my query, I assume cleaning the lens contacts solved the problem.

Posted on Feb 07, 2012


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When I turn my D40 on there is an F flashing and it says Lens not attached , can you tell me what this means and how I can fix it?

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.

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1 Answer

Can't take picture. "F" is flashing

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.

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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

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1 Answer

I get the letter "F" flashing on and off. What is it?

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.

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