Canon has just announced the EL-1 Speedlite, a high-end on-or-off-camera flash that comes with a new rechargeable battery pack and a very low minimum power setting for creative uses.
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Canon EL-1 Flash Review by Ken Rockwell
Canon Announcements (Page 5)
Jeff Cable's Blog: Using the new Canon Speedlite EL-1 professional flash (Real world test)
Canon's New Red-Line Speedlite EL-1: Better Control, Greater Expression
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Anyone else got the Canon Speedlite EL-1? Thoughts?: Canon EOS R Talk Forum: Digital Photography Review
This Epic Flash Dances in the Rain: Canon Speedlite EL-1 Review
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Canon's new flagship EL-1 Speedlite flash comes with updated interface and new creative options: Digital Photography Review
This Epic Flash Dances in the Rain: Canon Speedlite EL-1 Review
This Epic Flash Dances in the Rain: Canon Speedlite EL-1 Review
A real-world test of the new Canon Speedlite EL-1 professional flash