The Sony 49mm Filter Adapter allows you to attach 49mm filters on select Sony Cyber-shot digital cameras. Mounting & removal of the adapter is simple, using its one-touch release, & its receiver attaches securely to your lens barrel.
This is the construction of a type of filter. The type of process used to create a filter can affect its price. Filters can be constructed out of regular glass that sandwiches a coloured gel in between or in high-end filters, raw elements are added to the molten optical glass so there is no risk of uneven colour or fading.