When buying wide-angle lens adapters, BEWARE that certain lenses labelled as 0.45x or 0.38x or 0.42x may in fact be only around 0.7x or 0.8x.
I have just purchased an "Advance" 0.45x digital super wide macro adapter (52mm thread diameter) ("manufactured by S.Bower, USA in Japan") - all clearly labelled on the box AND on the lens itself - and it is in fact 0.77x.
Checking the UPC bar-code, the item does not exist, but the manufacturer's name tallies.
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