No, the LCD monitor on the D40x is for menus, settings, and picture display only. This is a single lens reflex camera and as such, the image sensor is only exposed to light when the mirror swings up to take a picture.
It is used when you want to have the camera so close to the ground (or similar) that you cannot look through the view finder properly. The right-angle viewfinder attachment lets you see through the camera viewfinder at 90 degrees (right-angles) to the position you would normally, so your head would be above the camera instead of behind it.
One tends to use a Nikon remote to control a Nikon camera. This can be used when one is attempting to take a self portrait, or in conjunction with a tripod.
Yes.
The price of a Nikon SB 400 depends from what location one purchases it. The average price of a Nikon SB 400 is around $130 and a used one is around $50.
In order to purchase a Nikon tripod, one could find offers on the official homepage of the vendor (Nikon dot com), or you could purchase used devices on eBay or similar.
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Yes, the Nikon D3000 10.2 Megapixel has a face detection mode.
One may find a used Nikon digital camera on Kijiji, Craigslist or at Value Village. Models, quality and prices will vary due to the nature of the used goods marketplace.
There are many different Nikon cameras. The compact digital cameras from Nikon are mainly simple "shoot and point" cameras where you open the shutter, point the camera at what you want to take a picture of and press the shutter. Other Nikon cameras have an interchangeable lens and adjustable focus to improve picture quality.
I'm afraid this question is rather vague; you don't say where you are. However, Ebay will usually have a good range of Nikon equipment. In the UK, Ffordes, MXV and Mr Cad sell used equipment, Grays of Westminster only sell Nikon equipment and have a good reputation.
Since the Nikon Rangefinder is an older version of a camera, there are sadly very little amounts of places that will sell them. You could search it up on google though to look for used Nikon Rangefinders that people are willing to sell.