<p>Hi,<br>
first of all I hope it is ok to post something like this and it's in the right forum..<br>
I know, actually advertising is not allowed, but I think this could be very useful for one or two.<br>
I wrote an App for the iPhone that allows you to measure the shutter-speed of a camera. This is very useful because often the shutters of old cameras are quite inaccurate.<br>
<a href="https://itunes.apple.com/us/app/shutter-speed/id560154244?l=de&ls=1&mt=8">https://itunes.apple.com/us/app/shutter-speed/id560154244?l=de&ls=1&mt=8</a><br>
The App uses an acoustic measuring method to determine the shutter speed. You record the shutter-release-sound and the App displays the waveform of this sound. The opening and closing of the shutter can be detected by two peaks in the signal. <br>
<img src="http://www.echolot-online.de/Shutter/Shutter_Speed_Lomo_small.jpg" alt="" /> <br>
Additionally, there is an "extension" to the App: A small phototransistor-plug that you can connect to the iPhone. With it, you can measure the actual light that passes trough the camera, instead of sound. This gives very accurate measurements. <br>
<img src="http://www.echolot-online.de/Shutter/aufbau.jpg" alt="" /><br>
Would be glad to see some comments about this :)<br />If postings like this are not welcome here I will remove it of course. <br>
Best,<br>
Lukas</p>
