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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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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1 Answer

F--error even though I cleaned connections with lens and camera

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

May 28, 2010 | Nikon D80 Digital Camera with 18-135mm...

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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F-- means that the camera cannot find an apeture with the other settings that it is on put yur ISO on auto and put the camera in automatic mode and it should work but it might be a problem with the apeture in the lense, in which case it would be very hard to fix and you would probably end up desroying the lense in the process, if you did not go to a specialist.

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Is the lens switched to manual as well as the mode dial. If the compatable lens is a minolta requiring an M42 adapter make sure that the protruding arm/rod is operating the shutter when depressed and that the adapter when fitted operates the lens when turned from auto to manual. Good luck.

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DON'T TRY TO FIX THIS YOURSELF! You will only add to the damage. If your lens is in warranty, contact Nikon for instructions to get it repaired. If it is out of warranty, I would either pay Nikon for the repair or take it to a camera repair man.

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