Digital just takes a small clip of the image and enlarges it while optical is just like if you stepped in closer to whatever you are photographing.
Digital image is depending on the camera resolotion, where optical image depends on the quality of the film. Normally an optical image will be better then a digital image, unless you are using high end digital camera. I hope this helps, Icko www.rtgallery.com
A optical zoom use the lenses to focus in on a subject, pretty much the same way binoculars work. Digital zoom magnifies the subject by enlarging in in the pic thru a digital process, this is not a true type of zoom.
An optical scanner can read text or illustrations printed on paper and translate the information into a form the computer can use. A digital camera encodes digital images and videos digitally and stores them for later reproduction.
There is a difference between the Nikon camera and the Sony camera. The Nikon camera has more features and it is also wireless. The Sony camera is digital.
http://www.amazon.com/Canon-PowerShot-Digital-Camera-Optical/dp/B000EMU4HS One is more expensive and claims to be better of course. They are virtually the exact same camera.
Optical zoom is way better than digital zoom as digital only expands the picture. Optical zoom actually zooms in.
Depends what your using it for
Optical and digital. With optical zoom, the camera uses lenses to magnify objects. In digital zoom, the camera's built-in software creates a magnified image.
Since both are optical zooms, the 36X is more versatile and better as it covers 7.1X and beyond , depending on the need.so, in this respect the NikonP500 is certainly more advanced
Optical resolution
The main difference between a digital camera and a regular camera is that a digital camera does not need film in order to work. The Canon A430 is inexpensive and a good starter digital camera. It's priced around $170 but will last you a long time.
You need to expand your question a bit more. Are you asking about the differences between digital vs. film? That question is being answered in other threads. OR.... Are you asking if you can convert a film camera to digital? The answer to that is yes, sometimes. Personally I would not recommend it, just go buy a digital camera.