When i render my product ther are a light problem when i import to photoshop or i zoom (pixelated)
Sorry. I have no clue how to help you. Because I don't understand your problem.
Do you have white pixels on the metal parts?
Do you have a screenshot that explains the issue?
If you are zooming past 100% in photoshop it will looked pixilated.
Then render a much higher resolution and scale it down in Photoshop.