Question about Nikon D70 Digital Camera with 18-50mm Lens

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Black particles on focusingscreen

I had camera cleaned because of black dots and fiber pieces on the focusing screen. It was fine until I changed lens. After changing lens I found more black particles on focus screen.I had checked the lens befor pitting it on and it was clean. The black particles have to be comming from something in the camera when I change lens. any suggestions.

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If the specks are just on your viewfinder focussing screen, they won't be on your pics. If they're on both your pics and focussing screen, you need to find someone else to clean your camera. Cleaning either your CCD sensor or your screen yourself can leave scratches. Changing lenses often can suck dust into the inside if the body is dusty. Try another repair shop for thorough cleaning - it shouldn't cost more than $50.

Posted on Dec 17, 2006

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Posted on Jan 02, 2017

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The screen of the viewfinder has a black dot.. i tried to clean it but it cant be removed,..how can i removed it?


Remove the lens of your camera, do it in a clean room, look at the mirror insie the lens to see if the dot is not there rather that on the outside of your viewfinder.
If it is not there it might be on the inside part of the focusing screen. Still inside the camera look at the upper part of the body, the focusing screen looks opaque.

If you still cant find the dot it might be on the inner side of the focusing screen.
Here is a tutorial on how to remove it on a d70 it is essentially the same thing on your camera.
Otherwise it can also be on the inner part of the viewfinder. In this case I recommend to send the camera to a repair shop as the removing of the viewfinder seems to be more difficult on the d3000 than on other camera.

Hope this helps.

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Sir, its white small dots on complete screen, like sky with stars,


Place a white piece of paper about 1000mm in front of the screen and focus the image sharply.
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My canon rebel xsi is not letting me take a picture on auto focus


It is possible you are trying to focus on somethind that is either completly white or completely black. It has trouble focusing in the dark as well. make sure your auto focus point (The red dots in your view finder is in the centre. you can move the red dot with the button on top of your camera that looks like 4 squares. simply look through your viewfinder push the shutter button down half way and the red dot should flash. if it isn't in the centre then move it with the button on top (4 squares) and try again until you get it in the centre.

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I have a Canon EOS Digital Rebel XT with the original 18-55mm lense and a Quantarey 70-300mm lense. Have had all pieces for 3 years now and everything worked great until last night. Camera focuses and...


This means that the communication with the Quantarey lens is not the right one.

You can try in cleaning the lens contacts and the camera contacts with a pencil eraser or a white erase (flip down the camera so no particles get inside the mirror box).

If still you are having problems, then that means the Quantarey lens is defective, and either needs to be service to be repaired, or you will need to get another zoom lens.

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The view finder and focusing screen are separate from the CCD sensor. The mirror reflects the image to the view finder until you take a picture. Then the mirror goes up, the shutter opens to expose the CCD to capture the image.

If you have a lot of dust, you should look into a cleaning kit, or have it professionally cleaned. This will show up on your images as white and/or black specks.

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Black dot.


Ensure focusing is spot on. if your image is a black dot surrounded by white light (like a doughnut) then your not in focus. Look at making a Hartmann Mask (really easy, just google for it), which fits over the front lens. It has 2 or more holes in it,this means when you look through the eye piece you will see double images, adjust focus until the images merge into one (if the images go further apart turn the focuser the other way), when they are merged remove the mask and presto you should be in optimum focus. Always remember telescopes are very sensitive and focussing requires delicate adjustments.
Regards and Clear Skies
Carl

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