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The flash output from K&F is sufficient. Very good.
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That doesn't fit me because the adapter is too big. I use the Sigma 105 2.8 Macro.
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As the name of the device suggests, it flashes and is particularly useful for macro photography.
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yes,it is not compatible if it doesn't have a center pin hot shoe.
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For Canon DSLR+Marco Ring+E-TTL+GN14 can work with canon 6d mark ii
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Make sure you get the kit that is compatible with the canon. The step-up rings are threaded to fit the lenses filter size and the light fits on the ring adapter.
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the ring adaptors are metal