Step-Up Rings allows you to adapt larger filters to smaller filter threads.

FAQs
What is a step-up ring?
NiSi step-up rings work with filters, but they are not filters themselves. Instead, these products serve as adapters with threads on both sides, allowing you to use filters with different size lenses. For example, you can screw the step-up ring into a 67mm lens and then screw a 77mm filter into the ring.

Why and when would you use a step-up ring?
Step-up rings allow you to purchase a good quality filter for your largest lens size, but use it with all the lenses in your bag. The first number in the step up ring description is the size of your lens thread and the second number in the description is the size of the filter you are adapting.

Does it matter if the ring is made of aluminium, brass or titanium?
Aluminium being the cheaper option is not as durable as brass or titanium and is prone to getting jammed in very cold conditions. Brass and titanium step-up rings have different advantages. Brass is a cheaper but robust option however whilst it is an improvement on aluminium it can still be reactive to the cold causing it to contract and in some cases become more difficult to screw on or off without warming it up. Titanium on the other hand has little if any reaction to the cold so it is best suited for harsh cold weather climates. I recommend the brass step-up rings as they include an antireflective matting, have knurling or grip on the sides of the filter to make it easier to remove. If you have questions about materials, you can contact me via the link in the menu.