Hi,
my name is Lukas and I wrote a little app for the iPhone that allows you to check the shutter speeds of your cameras or your LF-lenses.
I thought this might be helpful for one or two, so I'm telling you about this
The App itself uses a acoustic measuring method to determine the shutter speed: You can record the shutter release sound, and the App displays the waveform of this sound. Because the shutter makes a noise, when it opens and closes you can see two peaks in the signal. The time between those peaks is the shutter speed of your lens/your camera.
Of course, this acoustic way of measurement has it's limits. That's why I invented a small extension for this app: A phototransistor-plug. With a small phototransistor at the top, it allows you to measure the actual light passing through the lens:
It's pretty simple to use, just point the camera or the lens against a bright lamp, position the fototransistor-plug behind it, and release the shutter:
What you get is a waveform like this:
You will see two clear peaks, and you can easily determine the shutter speed from this.
The App plus the phototransistor-plug is a very powerful tool that allows you to check the accuracy of your lenses/your cameras quickly and without wasting money for film. I already sold several of them and I only get positive reviews about the plug.
If you are interested and if you have an iPhone/iPod Touch/iPad, I would be glad if you give it a try:https://itunes.apple.com/us/app/shut...l=de&ls=1&mt=8
And if you like the idea and want to get more precise measurements, especially at faster speeds, you may want to try the phototransistor-plug as an extension: http://www.ebay.com/itm/Shutter-Spee...item3a81f265cd
Thank you
Best,
Lukas
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