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Filmomat Photoplug Smartphone Shutter Speed Tester (free APP download required)

$39.98

The worlds first and only optical shutter speed tester.

Buy the plug, download the app (for iOS or Android) and start making precise exposures today.

Instructions here:

https://drive.google.com/file/d/0BxEX-OlKQPG9T2pIZ2FRc1dVWl9WUzFUUC1xWE94WGF5UlpN/view?usp=sharing