Aluminium Adaptor Ring for Square Filters
If you are using Breakthrough Photography square filters then you will need a filter holder and also an adapter ring to connect the filter holder to your chosen lens. Designed to place the filter as close as possible to the lens front element to prevent vignetting. It is possible to keep the adapter ring attached to your lens at all times as your conventional pinch lens caps will still fit, so no separate white caps needed.
If you do not have a conventional “pinch” lens cap Breakthrough produce a range of lens caps from 46mm upwards which exceed that of provided by the manufacturer made from 100% recycled plastic