Telecine, Film Chain, Definitions?

[DriveIn]

I have heard mention of film chains when talking telecine. What is a film chain compared with other methods, and how many methods are there of doing transfers? Noticed Film Chain mentioned on here before and now in an eBay auction as well, so I thought it is time to ask. eBay links are below if anyone is interested in explaining the difference in the units. I am curious, I am not looking to buy one of these. Just want to know what they are and how they are used.
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http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 1943720340

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 1943720303

[Actor]

The telecine is a device for converting film to video. It has a transport to move the film footage across a scanner that reads each frame and converts it to a video signal. Broadcast-quality tlelcines are very sophisticated. Many can handle a variety of film formats (35mm, 16mm, super 16, super 8). The telecine's precision film transport can accomodate either positive or negative film at several different speeds with no danger of scratching. One of the most widely used telecines is the Cintel (formerly Rank Cintel) flying spot scanner. Flying spot systems use a CRT to project a beam of light on the film as it passes the scanner. CCD scanners use digital CCD technology to read the film. Popular CCD machines are mde by Philips and by Bosch. Both flying spot and CCD systems produce excellent results.

In addition to ture telecines, there are other devices that can be used to do film-to-video conversions. The film chain is made up of a film projector that projects the image directly into a video camera. To avoid flicker with an NTSC video transfer, the projector must have a five-bladed shutter. Film chain transfers are less expansive than true telecines and they provide much less control over the film movement and image. The film chain projector mechanism is not gentle enough to allow transferring negative. Another device looks like a flatbed editing machine (or may be attached to one) and is particularly useful for low-cost transfers of synched workprint for video dailies.

In general usage the word telecine is often used to mean any film-to-tape conversion.

Ascher, Steven and Pincus, Edward; The Filmmaker's Handbook; pp 511 - 12.

My own take on the above is that a telecine moves the film continuously while it is scanned thus allowing all 525 lines of NTSC video to be captured. A film chain uses a projector with a shutter which means you lose one field of video while the shutter is closed and the film is moved, i.e., you only get 262 lines of NTSC video.