Field Camera
I am not entirely sure what you mean by portable, most cameras are to a certain extent portable. However if you are looking for a camera that you can use different lenses and attachments with you would have to go with a DSLR of some sort. I use an Olympus E410 which uses EOS lenses. It is a perfect camera for my needs but you would have to determine which make and model works for you. Just remember, no camera that gives you the ability to change lens is going to fit into a pocket.
No, Kodak camera lenses are only useful on Kodak cameras. However, several Kodak lenses are interchangeable with OTHER Kodak camera lenses. To see which ones, visit http://www.kodak.com.
18-55mm focal lenses are very good lenses for the Samsung digital camera. Other good lenses for the Samsung digital camera are the 28-90mm and 35mm focal lenses.
NO Nikkor lenses are compatible with all nikon slr's the DX lenses are for the digital camera's other wise there for the 35 mm NO Nikkor lenses are compatible with all nikon slr's the DX lenses are for the digital camera's other wise there for the 35 mm
In a way, yes. The dual rear camera are two lenses. One of the lenses is for depth information, the other is the actual camera.
Generally, no. Each manufacturer has proprietary mounts for their lenses and, for example, Nikon lenses will not fit a Canon and so on. There are aftermarket lenses made to fit various cameras, but you need to specify the make and even sometimes the model of the camera in order to get a mount that fits.
For a Canon digital camera, a 50mm camera lens is just about right. You can also use other lenses depending on what kind of digital camera you are using.
Camera kits can contain a variety of options depending on the manufacturer and the specific camera you are using. They can contain lenses, filters, bags, among many other things.
The lens performs two main functions; it controls how much light enters the camera by changing the aperture. The aperture is a variable sized "hole". With a smaller aperture, less light enters the camera and also more of the image will be focus. The other major function is to bring objects into sharp focus onto the focal plane of the camera (where the sensor or film is).
Olympus Camera lenses can be found at most camera stores or best buy and some other electronic stores. Prices do vary and i would suggest shopping around since I am unaware of your location it is hard to say a exact place to get one for cheap.
polarization
Typically camera lens for tamron will not fit another camera only because they are usually specifically made to only fit their own cameras and not others.
The Nikon D90 is one of the newer Nikon cameras. It comes with a detachable lens that is compatible with other Nikon lenses.