I just bought a set of lens in ebay, which name is "Meteor".
It includes 7 separate element lens, 2 extend tubes,and 1 main tube that includes aperture.

Over all in the case and lens, I can only find few words that are "Meteor" and F stops(shows in number from 0 ~5), each separate element lens engraved the different number in the rim, 15,25,35 to 75. I think it means the focus of separate element lens.

So, I have 3 questions...
1. Who is the maker of these lens?
2. I know two of separate lens can combined togather and get a new lens which has different focus, but I dont know how many ways I can combined them and how about the focus & coverage for each combination. Who have documents about this lens?(or in the internet?)
3. Any comments for the quality of this lens in shoot photo?

Many thanks!!!!!!

Sean.W