transparency issue

Nahp

Hi there, 

I need your help, I try to find an answer to this : (see the picture)
On this, I want to see only feather but as you can see there is a part around... how can I fix it?
I try to change some paramters on surfaces, but nothing change...
Thank you for your help.

 

Richard Haseltine

Is there a map applied to Opacity or Cutour Opacity, depending on which  shader is used? Is this an Iray render? Is it Daz Studio content or an imported mdoel from another application?

Nahp

I think it is an Iray render... 

Nahp

I found it... on object was superposed on the other... 

Solved.
Thank you Richard, your message gived to me an other idea. ^^