PN 11 extension tube

[emogirl]

I found a good deal on a pn 11 extension tube..only $100 in mint condition and I would like to get into some macro work. I am using d80 and 50mm 1.4, and also small zoom with it. What kind of magnification would i expect? I understand there is no metering with it or is there spot metering? Is it worth the investment?
thanks!

 

[emogirl]

bumping the post....some one in this gallery must have an answer for me?

 

[lostprophet]

don't get the Nikon tubes, get either a cheap set of 3 tubes from ebay for about $15 that way you can stack them together to get really high magnification or get a set of Kenko Teleplus tubes that will allow metering http://www.intro2020.co.uk/pages/kenko2.htm

as for magnification, I don't know as I've never tried it out