Shutter-Speed

Bought a photo plug years back and I could never get the clean on and off signal as shown in their company video. The signal captured was full of noise. Until I realized that most of the iphone lighting adapters are for headphones . Until I got a "trrs (tip, ring, ring, sleeve) to lighting" adapter for microphone. Most are "trs" and will not work properly when connected to an iphone, Also ensure it's Apple MFI certified. Now it's working without issue.

This app is excellent - zooming in/out on the waveform works nicely and it is easy to position and save measurements to the many mechanical cameras I own. It seems quite accurate between 1/1 and 1/15 even just using the built-in microphone, and that's plenty for me to perform simple checks for slow shutter speed accuracy. I've been using it mainly with SLR's, with the film door open and holding the mic close to the shutter mechanism. Thanks!

A good idea for folks who work with older, analog cameras - the simple idea here is that you can listen to the shutter or, with a simple light sensor available from the author, examine the light coming through the shutter and determine the shutter speed. The app provides a database for you to store results by camera. There are room for improvements (the application doesn't try and do its own analysis of the data, it's up to you; the application makes assumptions about possible shutter speeds) but those of us who need this kind of application will probably find it useful nonetheless.