I have modelised a logo. All is ok when rendering it. The resolution is 1000*700.
Now I want to render to High resolution, I select HD, and I also increased Camera Lens from 35 to 47, to get my LOGO bigger. When rendering it, it is dirty, my logo is fully aliased
That’s not aliasing you’re seeing – you’re trying to render the image at a resolution that’s higher than your current screen resolution. Blender is trying to scale the image down, to show you the whole thing at once. The problem is that the way Blender scales images in the render window, it looks really awful, and distorts the image, as you’ve seen. This doesn’t affect the quality of the final render, it just looks a little wonky until you zoom in, or save the image and view it somewhere else.