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so what the benefit of the converters ( for example the Grass Valley ADVC110 Advanced Digital Video Converter ) ???
They convert analog signals into digital ones, as a computer only works with digital information, this conversion is needed.
The converter you mentioned is for Standard Definition (SD) consumer sources like VHS and DVD players, game consoles and other devices that put out a composite signal.
A composite signal is not really a signal associated with quality, as a lot of information is not transmitted that way, but as the mentioned sources also don't have every information that a video image can store, it does not really matter.
can i connect the camera direct to the imac?what i will lose in this case?
As I pointed out in my last post, you can directly connect a DV camera to your Mac.
Look at the pictures and the surrounding text.
There is no signal loss between a DV camera and the computer while connected via Firewire, it's a 1:1 transfer.
But player decks with SDI (Serial Digital Interface) are sometimes preferred for capturing video, even DV. But those players cost in the thousands of €, so the Firewire cable will more than suffice.
what about VHS converters?
The converter you mentioned can be used to capture and convert VHS cassettes. The video is then transferred via the Firewire cable to your Mac.
Sometimes even a DV camera can be used, when it has some kind of video-in (most likely the yellow composite port).
you didn't tell me about the kinds of montage?(i want to learn if you provide me a source where i can read and improve my skills pls)
Montage is a broadly term. It just means the editing of one image after the other to assemble them bit by bit.
Montage is a french word and means "putting together".
http://en.wikipedia.org/wiki/Montage
So you have to be more specific what you really want.
Do you wanna make a video with just images of that event, cut to some kind of music, do you want to make a documentary, do you want to make something else?
Use the web search engine of your choice to find you some guides on introducing you to editing techniques.
There are plenty out there.
Ah, just saw that Montage can also mean: a filmmaking technique which uses rapid editing, special effects and music to present compressed narrative information.
http://en.wikipedia.org/wiki/Montage_(filmmaking)
I thought of Eisenstein, therefore I got the term in others ways as you might mean.