The troubles that can be solved for you:
1. Increase the diameter of the lens.
2. The adapter ring can be installed in front of the lens to enable different diameters to share accessories such as filters and lens covers with the same lens diameter. Replace filters, adapters, lenses, or other sizes.
3.When you buy a new lens with a different diameter, but you dont want to buy another set of filters for it, a adapter ring can easily solve the problem.
4. Save money and improve some dark corner issues.