The best replacement for high speed sync is hypersync.

The best alternatives to high speed sync are rated as following:

★★★★★	hypersync
★★★★★	nd filter

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Speaking about high speed sync, one probably shouldn't forget about manual flash.

Other search terms related to high speed sync and their ratings are:

★★★★★	manual flash
★★	yongnuo

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Google Trends

Scale is based on the average worldwide traffic of high speed sync in all years. Click on graph for more.

high speed sync

hypersync

nd filter