Many years ago, the guy who made the shutter speed sound testing app sent me a devise build into a TRRS jack plug to be inserted into the phone.
When exposed to light through the lens it gives a much more easy to read and precise measurement through the whole scale of speeds of a central shutter - much more so than when using the shutter speed tester with sound alone.
I don't know if these are for sale somewhere online, or if someone can decipher from enclosed photo of what parts they are made.
To my eyes it looks just like a photo resistor and maybe someone can decode the colors of the other resistor?
It are obviously very simple and only need to provide different levels of noise when exposed to different levels of light to work well with the app.
I have found it very useful.
Edit: I just looked up my old correspondence: The guys name is Lukas Fritz. He ended up calling the thing above "Photo-Plug" and had a website
www.photoplug.de - a url which now forwards you to another site:
https://www.filmomat.eu/shop/photoplug
They seem to charge €40 for the thing - which seems excessive.
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