clear filter for the .7 CO wide adapter 4 dvx

[slinks]

I have the century optics .7 wide angle adapter for the dvx100a and the lens cap for it is pretty bad and falls off all the time.

I was wondering if anyone knows of a cheap clear filter for it by chance. I really dont want to scratch this adapter, it cost me about 700 bucks.

thanks in advance for any help.