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Adapter rings are labeled from the camera to the filter.

The adapter ring's first number is the size of the male thread that screws on the existing lens.  The second number is the size of the remaining thread (a female thread).

For example, a 25.5mm to 46mm step up ring is used for a camera (or lens) with a 25.5mm thread. The adapter will allow a 46mm filter (or other adapter ring) to fit. 

Adapter rings can be stacked.  To use a 49mm filter on a 25.5mm camera lens, first use a 25.5mm to 46mm step up ring and then a 46mm to 49mm step up ring.
 

 
If your camera (or lens) has 24mm through 39mm threads, click here.
 
If your camera (or lens) has 40.5mm through 48mm threads, click here.
 
If your camera (or lens) has 49mm through 55mm threads, click here.
 
If your camera (or lens) has 58mm through 69mm threads, click here.
 
If your camera (or lens) has 72mm through 95mm threads, click here.
 

We offer a money back guarantee:  If for any reason you are not 100% absolutely satisfied with your purchase, please return it for a full refund (less shipping costs).