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The Autofocus does not work on my Nikon D40

I have a D40 and just recently the I cannot take a picture when the lens is in the Autofocus mode. Why?

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1 Possiable dirty lens contact terminals
2 Auto focus motor in lens is jamed/malfuntion
3 Auto focus engagement pin on camera body is not engaging the lens
4 Correct lens,old nikon lens and some 3rd party lens wont work on the D40

Posted on Jul 18, 2009

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1 Answer

Auto focus not working could you tell me if it is the lens or the camera that is most likely to be broken.


hi there,

what kind of lens do you use? D40 only support AF-S type to run the autofocus properly

have you switched the focus selector on the lens to A/M mode?
if you have but the autofocus is still not working, i assume that the lens-motor has broken

thanks

Jan 10, 2011 | Nikon D40 Digital Camera with G-II 18-55mm...

1 Answer

Bought a Sigma DG 70-300mm 1:4-5.6 autofocus for my Nikon D40. When the lens is attached the settings get locked on MF. Is there anything I need to adjust to fix this problem? Charles


The Sigma 70-300mm f/4-5.6 DG will not autofocus with the D40 since the lens does not feature an internal focusing motor (HSM). The D40 does not have an AF motor in the body and hence it can autofocus only with lenses featuring an integrated motor (eg. Nikon AF-S lenses, Sigma HSM lenses, Tokina DX II series etc). Unfortunately you can use the said lens only in MF mode.

Sep 02, 2010 | Sigma 70-300mm f/4-5.6 DG Lens

1 Answer

My D40 Nikon lens


Having gone over a month without a response, I assume this is no longer an issue.

Apr 13, 2010 | Nikon D40 Digital Camera with G-II 18-55mm...

1 Answer

170-500 apo nikon for nikon D40


it will mount fine, but I don't believe you will have autofocus.

Jun 09, 2009 | Sigma Zoom Telephoto 170-500mm f/5-6.3 APO...

1 Answer

Won't take pictures when set to A on the lense.


if you're using D40/X, make sure that the attached lens has built-in autofocus motor (e.g. code AF-S for Nikon, HSM for Sigma), because the camera does not have built-in autofocus motor in the body so only manual mode will work in most AF lenses..

if you're lens is already one with built-in autofocus motor, you might need to check the motor at a service center

Apr 16, 2009 | Nikon D40x Digital Camera

1 Answer

Best Auto focus Tele For Nikon D40


hi ! iam too a D40 holder,u can opt for AF-s versions or HSM sigma,both of them autofocus on d40,can go for 18-200 AFs VR or if u need still longer end go for 70-300 but it is costly than the sigms 70-300APO DG HSM MACRO..,its a much better reviewed lens and dont forget the cost..anyway do some research before considering..good luck

Mar 14, 2009 | Sigma f/NIKON- 28-90/3.5-5.6 Aspherical...

2 Answers

Autofocus will not work,


Camera wont let you take a picture until focus is locked, why are you using M (manual focus) if you expect autofocus to do it for you? In M mode it is up to you to focus correctly or camera will not take the picture.

Apr 13, 2008 | Nikon D40 Digital Camera with G-II 18-55mm...

2 Answers

Nikon d40 digital camera


When the camera is in auto focus mode, it will not take the picture until it locks onto a subject. If there is not enough light, the camera will "hunt" for something to focus on. Since it can't define any edges, it won't allow the shutter to release.

The D40 base model does NOT have a powered focus lever for autofocus, so if the autofocus is not working, suspect the lens.

Mar 23, 2008 | Nikon D40 Digital Camera with G-II 18-55mm...

2 Answers

No pictures when in autofocus mode


I was having the same problem with my D40... but I read your post, tried switching the 18-55 lens to manual, then back to auto, and it seems to be working fine now. Hmmmm... think maybe there's a circuitry issue with the lens?

Nov 11, 2007 | Nikon D40x Digital Camera

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