LENSES FOR A 35mm ADAPTER!

[*CHAOSMONGER*]

(I'm italian, so forgive by bad english!!!)
I have to buy a set of photographic lenses for my new 35mm adapter (an italian adapter... look this site http://www.wdr35.com ).
I need a set of three lenses:

28mm
50mm
135mm

For the 50mm I'll buy an original CANON 50mm f1.4
But for both the 28mm and 135mm the prices are too high! I know that there are different brands with the standard CANON FD attach, like Soligor, Tokina, Unitor, etc... and I found an used 135mm f2.8 Soligor for only $30!

My question is:
how better is the original canon lens than others sub-brands??
For my need, video-shot (and not for photo), the use of a poor brand is SIGNIFICANT? What's the difference? What's the risk??? Brightness? Chromatic aberation? Distorsions? All these defects are REALLY perceivalbe on a video-shot on standard DVX100?

HELP!!!

 

[KennyJay]

Chao I'm looking the 28mm and 135mm Canon lens also. I should have ask like you are doing but I've won an 28mm yesterday and bidding on a 135 today. I'm learning as we speak. All I know is that they should be 3. 5 fast or less. The 28mm 2.8 is $17 shipping included. I'm not expecting much from these cheap lens. I would prefer buying at a camera show or pawn shop or flea market. Where I can see it. However some of the sellers on Ebay give good details on what they have. I'm not in a hurry to buy really good lens yet. I paid $95 for a Canon 50mm 1.4. The same lens sell on Ebay for $80. You are doing the right thing in asking questions before buying. Let us know what you come up with.