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You can either use a PC cord to connect the flash and camera, or you can use a remote trigger to fire the flash cordlessly. Your local camera store should be able to provide options for both.
You might want to have a little look inside the mount on the camera body and make sure you haven't moved the little metal clip there. (I think it was on the left as you look at the open front of the camera). There was a thing on the Nikon web site about the clip and it possibly getting displaced, bent or broken. I only saw it whilst looking around about this camera just before buying it (I am a bit clumsy with stuff but mine is fortunately OK).
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.
The letters you're referencing is the M/A (manual / auto) focus switch. The lens has this switch and operates in Auto Focus mode when set to "A" and manual focus mode when set to "M".
You have to manually focus on the subject when in letter "M". If you do not, the result will be out of focus. From your description, it sounds like the camera / lens combination is attempting to focus and operate the shutter in auto, and focusing in manual; but due to some type of damage resulting from possible mishandling, exposure to dust, dirt or even moisture is interfering with the successful completion of the process.
You could isolate the problem to determine if the cause is in the lens or camera by simply attaching the lens to another compatible Nikon camera or placing a different auto-focus lens on your D40. The problem will either stay with your D40 or follow the lens when attached to a different camera. It is also *possible* that due to numerous attempts of auto-focusing with your D40 & lens combination, that both the lens *and* the camera have been damaged. If the problem is severe enough, the problem in the failed device could cause failure in the otherwise normally working device, too.
You might be best served by contacting Nikon Service & Support below:
You also said you lost your manual. You can download the manual for the D40 directly from Nikon in your choice of English, French or Spanish from the link below:
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
TAKE THE LENS OFF THE CAMERA. SEE IF YOUR CONTACTS ON THE CAMERA AND THE LENS ARE CLEAN, PASS A CLEAN PENCIL ERASER ON THE CONTACTS, DON'T LET RUBBINGS FALL INTO CAMERA!! TRY THE LENS NOW.
Hi, sounds like a shutter problem, try taking a picture in manual mode with an exposure of around 1 second and the aperturestopped right down (small appiture)in daylight.
when you say its not pretty i guess you mean blurred?
If your still getting a black image, take the lens off and put it in bulb and press and hold the shutter release if the shutter dose'nt open and stay open while you hold it then its certainly the shutter.
Its not your fault, all the eos cameras are prone to shutter failure
some are fine for 50,000+ shots others die within a thousand
My fingers are crossed for you that its under warranty.If not a repair in the uk can be done for around 140ukp or $200 in the US, the shutter isn't expensive (about $60) but its several hours work to replace it
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