The 52-58mm ring adapter easily screws into the front of a 52mm lens and converts the lens thread size to the thread size of other 58mm accessories (filters, hoods, flashes, lens converters, etc.)
It is very good. Sturdy and lightweight Specifically designed for camera for a tight, secure fit. No wobbling or cross-threading.
The first number is always the lens thread size, the second number is the filter size of the accessory. If the first number is large, it is the ring. If the first number is small, it is a step-up.
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