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This XTL-1 Flash Extender Conversion Lens from Harbor Digital Design can be used to modify your Ultimate Light Box or Black Box and amplify the range and output of your on-camera flash by up to 2 stops at up to 100' away.
For Ultimate BlackBox/Ultimate LightBox
Gain up to 2 f/stops @ 100' (30.48 m) from camera
In the Box
Harbor Digital Design XTL-1 Flash Extender Conversion Lens