How to take photos in black and white for Nikon 40dx? What is the normal setting of Nikon 40dx? Please send me a manual for Nikon 40dx?

There is a setting for that alot of professional photographers love black and white as we all do color is not that challenging

There is no black and white mode in a Nikon Coolpix L100 camera. You can take a picture and then convert it into black an white through any photo editing software like Adobe Photoshop.

Set the picture control to Monochrome. See page 76 of the manual: http://cdn-10.nikon-cdn.com/pdf/manuals/dslr/D3200_EN.pdf

In general you're better off shooting in color and converting later on a computer, where you have much more control over contrast, brightness, and other factors.

You have to know the MODE your camera is in. If you have it in the wrong mode you may not be able to take a photo in some conditions. You typically cannot take a photo of the moon on any auto setting the moon will be a white blob. The moon almost has to be taken manually.

Search for Lens Error. There are many was to fix Lens Errors

Hi,
Go to Shooting Menu---Optimize Image---set Black-and-White.
Else, For more detail visit this link.

Have a nice day & Don't forget to rate the solution.

Check your white balance or wb button.

You can't, there is no black and white mode on the D50. You will need to take color photos and convert them with photo editing tool.

Set it to a manual white balance colour temperature, 5200K being an average one to start testing at. Does this make a difference? If not, then the sensor, RGB lightmetering sensor or exposure board may be at fault. The peripheral area of most sensors is used for white balance metering, which denotes a sensor issue, although if the exposure board isn't reading this information correctly, then it will give varying results. However, Nikon's 420 pixel RGB sensor on the D200 may also be taking WB readings. I'll be talking to Nikon soon, but try manual settings first.

Your camera is fine. Read the information shown in this: Link

Eith you have not set the camera up correctly study thew manual - it is not unusual to have a black and white setting. If you are sure you have got it right Then contact Nikon - this is a CCD failure.