The answer starts with another question: How many lenses do you own with different front thread diameters? 49mm, 52mm, 63mm, 72mm, 77mm? If you have several like these, then maybe you also have several sets of filters to fit the lenses.
The answer to the real question is that the above object is a set of step up and step down filter adapter rings. It consists of ten adapters of each type ranging from 30mm up to 82 mm. A set like this is available from suppliers like Amazon for about $25.00 USD. Individual rings used to cost about $10.00 USD each.
The value of this set is that you need only buy one set of filters; the largest diameter to cover your largest lens. Then with the appropriate ring in place, the large filter will cover any lens in your bag.
High quality filters like neutral density and polarizing filters are expensive and may cost as much as $100.00 USD or more. And why would you not want to use a high quality filter on your good lens?
Having a good assortment of adapter rings is a no-nonsense investment. Get one for your camera bag, and invest in high quality filters instead. Your images will show the difference.
© 2023 Brian Loflin. All rights reserved.
Brian Loflin - Natural Science Photography 