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Flash extender?
Flash extender? Anyone use one? Do they work? Reviews I've seen are all over the place. I'm shooting a Nikon D500 and I'd like to improve its low light performance when I have my 200-500mm f/5.6 lens attached. I understand these extenders are not recommended for less than 200mm focal length, so that's fine. But I'm curious if they work as advertised, allowing f...
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