The best replacement for atomos ninja is blackmagic hyperdeck.

The best alternatives to atomos ninja are rated as following:
★★★★★  blackmagic hyperdeck
★★  ki pro mini

Your alternative for atomos ninja is not listed? Suggest!
Speaking about atomos ninja, one probably shouldn't forget about fs100.

Other search terms related to atomos ninja and their ratings are:
★★★★★ fs100
★★★★ gh2
★★★ 5d mark ii
★ c100
You have in mind a companion for atomos ninja and it is not yet here? Propose!



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atomos ninja
blackmagic hyperdeck
ki pro mini