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The #491 Step-Down Ring 46 -4 0.5mm is a reliable and economical way to use filters. Using this ring saves you money since you won't have to buy the same filter two times for two different sized lenses. This 46 -4 0.5mm Step-Down Ring allows you to use 40.5mm filters on lenses with a 46mm front filter thread size. A series of these reasonably-priced adapter rings is far less expensive than buying the same filter in two sizes. However, it should be noted that care must be taken when using Step-Down Rings in order to avoid vignetting. The rings are constructed of brass and feature a matte black finish.
Heliopan has been a leader in the photo/filter industry since 1949. They are known for their high- quality and production standards. Heliopan offers a full range of brass adapter rings that are renowned for the durability and reliability. Less expensive stepping rings have a tendency to "jam" or jump threads. However, Heliopan brass adapters screw on and off with greater ease and demonstrate less chance of damage.
Small, efficient way to save space and money at the same time
Allows user to buy fewer filters but continue to shoot the images they want