Lens hoods are primarily designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens. In addition, since the end of the lens is extended, you also get the added benefit of some extra protection from accidental impact.
Dedicated lens hoods are designed to match a specific focal length of a specific lens.
For 25mm f/2.8 lens use 55-86 ring (#928129)
For 28mm f/2.8 lens use 55-86 ring (#928129)
For 28-70mm f/3.5-4.5 lens use 67-86 ring (#928159)
For 35-70mm f/3.4 lens use 67-86 ring (#928159)
For 35-135mm f/3.5-4.5 lens use 82-86(S) ring (#928170)