Does the shutter works accurate?

Check the shutter-speed electronically.

How to check the speed of the shutter from your classic camera.

If you want to use your classic camera and would like to know whether the speed of the shutter is reliable or not.

You can check that very easily.

1) To do this you’ll need the program "CoolEdit2000" or any other sound program.

2) Cut off your microphone from the microphone-wire connected to your computer.

3) Connect the phototransistor i.e. BPW40 to the wire.

4) Take a piece of board (6 x 20 cm) drill a hole in it, just big enough to hold the phototransistor and mount the phototransistor in the hole.

5) Cover the board with black velvet or leather or anything else as far as it is black. (leave the opening for the phototransistor free).

6) Place the shutter above the phototransistor and a strong light above it. 

Selected  Shutter speed 1/200 sec to test.

7) Start "CoolEdit2000 ", hit "FILE" then "NEW", say OK to the waveform, cock the shutter, hit "RECORD" and fire the shutter.

8) STOP the recording and zoom on the wave .



Read out recorded shutter-speed 0,004 = 1/250 second. Not bad at all. 

I'm sure you wonder how they tested the shutter speed back in the beginning of the last century without having computers and electronic devices.

The next page will give you a clear answer to that including a photo of the mechanical shutter tester.

Mechanical Shutter Tester

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