Camcorder Dof Adapter

Whats the difference between canon fd lenses?
I have a 50mm canon lens only reads 1:2. Whats different between this and say 1:4 or 1:8? Im hoping to use this on a dof adapter on a camcorder.
to carlos, thx… so this lens will give good dof? I got a pic, hopefully yahoo will allow it.
[url=http://www.ephotobay.com/share/c50mmfd12.html][img]http://www.ephotobay.com/image/c50mmfd12.jpg[/img][/url]
[url=http://www.ephotobay.com/share/c50mmfd12.html][img]http://www.ephotobay.com/image/c50mmfd12.jpg[/img][/url]
[url=http://www.ephotobay.com/share/c50mmfd12.html][img]http://www.ephotobay.com/image/c50mmfd12.jpg[/img][/url] hm… not working. to me it’s not show the whole link
The number after the : is the f-number, the lower this number is, the greater the aperture of the lens (more aperture, better image in low-light situations). Also, with a greater aperture the area in focus (depth of field) is smaller (think of a portrait where the face is in focus but the background is blurred). Normally, lenses with large aperture are considered better. I hope this helps!
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