Why won't it focus?

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The Top 4 Causes of Blurry Photos, And How To Fix Them ...

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Out of focus An image that is out of focus will appear blurry. ... The first is to increase the shutter speed as explained above, The second is to hold your camera steady whileyou take the shot. .... It's always very helpful, and I enjoyed the video.

Why Do My Pictures Come Out So Blurry? « Samsung Galaxy S3

Possible that you gat a slow shutter speed. Or your camera might be getting faulty. When the shutter gets damaged then the blurry focus wont change unless its fixed. The four main causes of blurry photos are:

1. Out Of Focus
2. The subject moves while the shutter is open
3. The camera moves while the shutter is open
4. Depth Of Field is too shallow

Unless its just technical or hardware you will need to visit a technician. or replace the Shutter.

You did not say which lens or lenses you are using, but most auto-focus lenses have a switch for selecting manual or auto-focus. First, check your camera's menu settings to make sure auto-focus is enabled and then your lens to make sure you did not accidently leave it in the manual focus position? If it is in the auto-focus position and still not taking sharp pictures, switch it to manual and see if you can get it to focus correctly. It is also possible that your auto-focus alignment is out because your camera was bumped, jolted or dropped. If realignment is necessary, you can send the camera and lens to Nikon for repair or find a knowledgeable camera repairman.

There are several possible causes for blurry pictures.
1) Camera motion. If everything is blurry, it's most likely because the camera moved while the picture was being taken. Make sure your shutter speed is fast enough if you're handholding the camera (longer lenses require faster shutter speed). Alternatively, put your camera on a stable surface, such as a tripod or a tabletop.
2) Subject motion. If the subject is blurry but the background is sharper, then the subject may have moved while the picture was being taken. Use a faster shutter speed. Raise the ISO if needed. There are limits, of course. If you're trying to photograph a fast-moving object in the dark, you probably won't be able to.
3) Improper focus. If the subject is blurry but something else in the picture is sharp, then the camera probably focused on the wrong object. Move the focus selector to the subject you want in focus. Alternatively, center the viewfinder on the subject, press the shutter button halfway to lock focus, then reframe and shoot.
Without any more specific information as to what and how your pictures are blurry, I'm afraid the above is all I can give you.

Method 7 but have to give slight assist in the opening & closing every time. Everything else works as before. So far so good!!

You don't say anything about light conditions, target color, definition, contrast, and the many other things that can cause this.

Is your camera at fault? Maybe.

Take a look in these sites and many others like.
Your camera won't focus?

Digital camera focus tips

Is it the viewfinder (that you hold up to your eye) or the screen that's blurry?
If the viewfinder is blurry, there should be a diopter adjustment to fix it, probably right above the rubber eye cup.
If the screen is blurry, you should take some pictures and video and view them on a computer. I they are sharp on the computer but blurry on the camera screen, there may be a problem with the screen and you may need to take it in for repair.
If the pictures are blurry on the computer as well, the camera may not be focusing properly. If you can't focus manually, or the camera can't focus when auto focus is turned on, you have good light, and aren't too close to your subject, then it may need to be serviced.

Can you show us any examples?

try manual focusing vers auto focus.

The lens is out of focus or the shutter speed is too slow, to determine if this is a defect or failure, mount the camera on a tripod and use the self timer or remote cable (if you have the remote cable) to take exposures while autofocusing on a neutral colored object such as a beige item,

if they're still blurry then manually focus the camera and try again.

If they are still blurry and your Nikon has a diopter focus adjuster (this is typically in the rear next to the viewfinder where you focus your eye), set the diopter to neutral and manually focus again.

If they are still blurry, remove the lens and using a cloth dampened with high percentage or denatured alcohol, clean off contact rings since this is where the lens and the camera body communicate and transfer focus data.

If they are still blurry, then use the same cleaning method for the contact ring of the camera body.

If they are still blurry use a different lens and repeat the first two steps.

If they are still blurry then you may have a smudged and dirty sensor, this is the part which actually registers the image and should be cleaned by a professional.

If you are so brave to, you can use the cameras feature to lock the mirror and expose the sensor, this is typically only done to perform a dust cleaning using light blasts of clean air and using solvents on the sensor is dangerous.

If you choose to do so anyway, use a bright flashlight and look for anything that appears to be smudging, if it isn't apparent then your camera or lenses are likely in bad need of maintenance.