Allows you to use larger size filters on lenses with a smaller diameter thread. The first number is the size that screws into the lense, the second number is the filter size.
Reviewed by 2 customers
No problems. Simple item that does the job at a reasonable price.
I bought this to fit an Olympus Trip 35 that I had not used for 20+ years. This allows me to use common 46mm filters on a camera threaded for a rare 43.5mm filter. This allows the meter to be fully covered by the filter and compensate for the exposure. The only drawback is the ASA setting is easily changed as it is set on a ring that also has the threads for the filter. Just need to double check it.