The Standard shader has a secondary layer of reflection, called simply reflection, which is perfectly sharp and mirror-like. It should only be used to replicate perfect mirrors or glass shaders. If you want blurry reflections only you should use Specular.

Color

 

Weight

Enable internal reflections

Disabling 'Enable Internal Reflections' can dramatically reduced render times for highly reflective/ refractive scenes.

Fresnel (Enable)

Enables or disables the Fresnel effect.

Reflectance At Normal

Reflection Exit Color