Flash Hot Shoe Mono/PC Sync Adapter – Camtraptions
Mayitr Metal 1/4" Flash Hot Shoe Mount Adapter For Canon 580ex Ii/580ex/550ex/540ez/430ex Ii/430ex/420ez/380ex - Photo Studio Kits - AliExpress
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Amazon.com : Pixel e-TTL Flash Hot Shoe Adapter with Extra PC Sync Port for Canon DSLRs and Flashguns : Flash Shoe Mounts : Electronics
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Flash Hot Shoe Mono/PC Sync Adapter – Camtraptions
DeLOCK Compact Flash Adapter voor SD/MMC kaartlezer Zwart/geel, 61796