Hi, I have a new (less than a month) D40x camera and recently noticed that in every picture I take, a small gray spot appears in the upper right section. This is most noticeable when I view the pictures on my computer. The spot is most apparent when the background is white or light in color. Also, I notice the spot more when I "zoom in" with the lens. I only have one lens so I can't be certain if it's a lens problem or a camera problem. Still, the spot is at the same location regardless of how far I zoom in or out in any given picture.
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Hi jchp_2001, I want to help you with your question, but without more information from you, I can only guess what you mean?
What do you mean by "sharp spots"? I will assume that you are talking about speckles of white or colors in the deep shadow areas of your pictures or in black areas of night time exposures. What you are seeing is electrical noise generated by your camera's sensor and amplified by other electronic circuitry in your camera. Newer and more advanced cameras have higher signal-to-noise (S/N) ratio circuitry that reduces, but does not entirely eliminate the problem. The S/N ratio is a measure of how much stronger the picture information is than the electrical noise (analogous to to the static you hear on a week AM radio station). The higher this ratio, the fewer artaffects, such as spots, will appear in your pictures. There are a couple of ways to lessen this problem. You could use a shorter exposure time, lower the ISO setting on your camera (of course that would increase the required exposure time and my nullify the benefit), or illuminate the shadow areas with supplemental lighting. The other way is to buy a newer camera that has a higher S/N ratio. One of the main goals in new sensor and camera design is to raise the S/N ratio. Trading in your D40x on a newer model DX (24x16mm sensor) format camera will help. The reason that professionals more advanced photographers spend thousands of dollars on full frame (36x24mm sensor [the same size as a 35mm film slide]) digital cameras such as the D600, D610, D800 or D810 is because the larger sensors have an inherently higher signal to noise ratio. That is in part why your D40x gives you better quality pictures than a Coolpix camera for example, which has a smaller sensor.
If the spot appears on pictures you view on the computer or in prints, then the spot is dust on the sensor. If not, then the spot is on the focusing screen. You can clean the sensor but you will need some supplies and a little knowledge. Google the words "cleaning a DSLR sensor" and you will find sites with pictures explaining the procedure. It's not difficult. This problem is common with all cameras with lenses that can be removed.
It sound like you have some dust particles or a smudge spot on the CCD screen (actually on the low-pass filter in front of image chip). To leave an image on CCD, the dusts must be closer to the image plane to be registered so it should be somewhere closer to the screen or right on it. Take a look at the screen with "CCD Clean" mode and blow out any dust. If the smudge is on the screen, I recomend trained tech should clean it. good luck. For further assistance by email, go to www.camerarepairjapan.com
take the batteries out of the camera and the memory card..verify that the memory cards are good by trying them in a printer or another cam.. other thing is you might not be in picture taking mode..you might be in the settings mode..check the user manual if you don't know if you are.
Does it appear on the photos if you look at them on a computer or print them out, and does the spot remain when you're using the menu? If it's there all the time (on menus as well) it would suggest part of the display is starting to fail. Also, have you done the shutter hold-up so you can check behind the mirror just in case it's something on the sensor (assuming it's not just the LCD that's failing)?
Your sensor may have gotten dust on it to confirm this, set camera to a small aperture eg. f22 and take a picture of a white page then set camera to a large aperture eg f3.3 ant take the same picture. If it is dust you will see the spot on the shot taken at f22 and not the one taken at f3.3. This can be solved by having the sensor cleaned. If the gray spot is on both images you most likely have a damaged sensor