My auto focus quit working on my camera not sure what happened. I was taking pictures at my granddaughter Homecoming last night and it just quit. I had changed from regular lens to a zoom lens , which I've done many times before. At first I thought it was my battery so I replaced it, didn't help. You can here it doing the auto focus but it just will not not take the picture, I changed it to manual focus and it works fine. Did I possibly touch something that I shouldn't have ? My Camera is a Monolta Dynax Maxxum 3Xi 35mm SLR....I've owned this camera for about 8 years now with no problems at all.
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Go to MENU. Then TOOLS. Make sure Motion Detection is in AUTO.
If that is on AUTO then Put the camera on a hard surface (like tripod) and focus and see if image is still blurry. Lastly, it is difficult to focus in some conditions. Move the focus point, you can click on the screen to change it. Blur can be caused by: long exposures, camera motion during photograph, bad conditions unable to focus.
The focus routine in this camera gets confused often. It can be frustration. It will only be in focus when it is GREEN before you shoot and the camera is not shaking. At night it can take great night shots with a TRIPOD and Exposure set to -1 to -2.
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 may be a few things preventing the camera from taking a picture. I don't know the lens you are using but by chance does it have an auto/manual switch that has been switched to manual? Also make sure the lens is locked in position. The camera won't take a picture unless it has focus in the auto focus mode, this is normal. What are you trying to focus on? The camera auto focus system will search and fail to auto focus on surfaces that have little or nor contrast. For example glass, chrome, a blank wall, water, blue sky. Other conditions that auto focus fails is being to close to your subject, heavy fog, a dim lit subject, available light and night photography. Once the little green confirmation light comes on the camera has focus and will operate as it should.
Try this. Aim the camera at the person/object you want to take a picture of. Press the shutter button "HALF WAY DOWN" wait 2 seconds then complete by pressing all the way down to take the picture. The auto focus works on the "half way down" stroke. Some cameras have a light that goes from red to green to let you know the focus was completed. Or, just wait the 2 or so seconds.
It sounds like you have a problem with the auto focus on the lens. The 18-135 has a focusing motor inside the lens itself. If this motor is not working, then it won't focus. It could also be the contacts (small and silver on the lens look like ball bearings buried halfway into the top part of the lens where it connects inside the camera body) or the contacts inside the camera body. These can be CAREFULLY cleaned with alcohol and a QTip or a clean pencil eraser. Just make sure you don't get anything into the lens or camera.
If the camera is over a year old, it may just be time to take it to the camera shop for a cleaning.
Be sure you are on auto. Pressing the shutter release down half way causes the camera to focus. This needs to happen to get a clear picture. Be sure you have adequite light or the auto focus will not work. You might need to set your flash to auto as well . Them by pressing the shutter release the rest of the way down, you will get a picture. But gain, you need to allow it to focus first, then take the photo.
Did it ever work on this camera?
I have seen some Sigma lenses that are auto focus on canon film cameras but then when put on the digital they dont work right. If you have used it on this camera then make sure the lens is clean.sometimes dirt on the front wil make it try focusing on the dirt. Next try focusing in manual focus to make sure the focus is working. Then take the lens off and then put it back on and make sure it clicks into place.
Let me know if none of those things work. also make sure to try focus on something close and somthing far away.
Sounds like you need to get your camera fixed by Nikon.
However, you say the auto focus stopped working, you didn't switch to a lens that uses a mechanical focus linkage do you? The D40 only supports lenses with AF-S or AF-I type autofocus drives. AF-D and AF-G types without AF-S or AF-I don't autofocus.
Also, check that the A/M switch on the lens is in the correct position.
Manual focusing is quite difficult to do accurately with an AF camera. The screen inside the camera is not optimized for this. If you are sure you are focusing accurately but the pictures you take are still out of focus, the mirror may need adjusting. I can provide further info on this if you require, but if you're within warranty, i'd recommend that route first.