K&F Concept 18-Piece Step-Up and Step-Down Ring Set 37–82 mm K&F Concept

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The K&F Concept set of 18 adapter rings contains 9 step-up and 9 step-down rings for threads from 37 to 82 mm. You can adapt filters and other accessories to lenses with both smaller and larger threads. The rings are made of aviation-grade aluminium alloy and suit manual and autofocus lenses.

Both directions in one set

Step-up rings enlarge the thread diameter of the lens and let you fit a larger filter, step-down rings reduce it for a filter with a smaller diameter. On wide-angle lenses a smaller filter may cause vignetting – check the corners of the image.

Easy to install

The ring screws into the filter thread of the lens and the filter or other accessory screws into the ring. The precise thread holds firmly, without wobbling and without the risk of cross-threading. The frame is finely polished with a careful surface finish.

How to read the ring markings

The first number is always the lens thread diameter, the second the thread diameter of the filter or accessory. If the first number is smaller, it is a step-up ring; if it is larger, it is a step-down ring. The filter thread diameter is printed inside the lens cap or on the lens barrel.

• 1 × step-up ring 37–49 mm
• 1 × step-up ring 49–52 mm
• 1 × step-up ring 52–55 mm
• 1 × step-up ring 55–58 mm
• 1 × step-up ring 58–62 mm
• 1 × step-up ring 62–67 mm
• 1 × step-up ring 67–72 mm
• 1 × step-up ring 72–77 mm
• 1 × step-up ring 77–82 mm
• 1 × step-down ring 82–77 mm
• 1 × step-down ring 77–72 mm
• 1 × step-down ring 72–67 mm
• 1 × step-down ring 67–62 mm
• 1 × step-down ring 62–58 mm
• 1 × step-down ring 58–55 mm
• 1 × step-down ring 55–52 mm
• 1 × step-down ring 52–49 mm
• 1 × step-down ring 49–37 mm

• Type: filter ring set (step-up and step-down)
• Number of rings: 18
• Thread range: 37–82 mm
• Material: aviation-grade aluminium alloy
• Use: lenses with a filter thread, manual and autofocus