Question about Nikon Macro Speedlight SB-21A TTL Ring Light Flash
I purchased a used Nikon SB21 speed light. The unit did not come with any of the step rings (52m, 62mm and 72mm). What I need to know is the MM size of the SB-21 so I can buy as set of step up rings for them to fit onto the flash unit.
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Posted on Jan 02, 2017
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