Yongnuo yn 560 iii UV filter holder
thingiverse
This is a remixed design made to fit these filters https://www.ebay.com.au/itm/293294398326?ViewItem=&item=293294398326 . You need to modify your flash by removing the 2 bits of plastic in the end , this will turn it into a full spectrum flash. Watch this video for a detailed description on how to modify https://www.youtube.com/watch?v=pTZZgWxx5S0&feature=youtu.be&fbclid=IwAR0TjRES5d69qLA0-9xXAWoAw9_fxI-1wen-yi3ZbXw4mcaHovHAAl6vCpoThis mod is best performed on a brand new flash that has never had batteries in it (even though you go no where near the dangerous capacitor inside). The filters will turn the flash into a UV only flash suitable for UVIVF Photography. Print at 100% scale and the filters are a very tight fit but they do go in. Seal along the top side of the filters with some black silicon to eliminate light leaks and voila. The cheapest way I could find to properly modify a flash for UVIVF Photography. Printed in Cura using tree supports.
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