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Computer-based shutter speed tester

Running the software

There is no special set-up for the software. Simply copy it into a directory and run it.

If you get a message box saying that the driver could not be loaded, let the program load and then close it. Re-run the program and it should work.

 

The main interface has the following activities.

 

first_view

 

Note The Flash Speed tester appears to work but I am not clear on how to position components to get correct results.

The Check button lets you see if the light source is being detected by the detection unit. To use this, set up the camera (eg in this picture) and use the B shutter setting, preferably with a lockable shutter release cable.

With the shutter open, click on the Check button. If the detector finds the light source the output will change to:

 

detector_ok

 

Next, click the Shutter Speed radio button and the tester interface will be presented:

 

main_interface

 

There are a few parameters you can specify before you begin.

  • You can name the camera - this will be included in saved or printed output.
     
  • You can specify the number of samples. BUT do not use too many as the software cannot be interrupted - this is a problem I have yet to solve - it must run until the specified number of samples have been completed.
     
  • You can select the shutter speed system to use. This comes from Thomas Tomosy’s material in the Appendicies of Volume 1 of Camera Maintenance and Repair.

 

The message above the output box tells you to Press Start - click on the start button.

You now run you first set of tests. They appear on the screen in this form

 

output

 

 

  1. The first column gives you the raw data as minutes:seconds:Milliseconds:microseconds
     
  2. The second column gives the speed according to the system you have selected - current logarithmic or older style sequence
     
  3. The third column then gives the percentage tolerance that the raw reading has around the dial value.
     
  4. The fourth column gives the raw data as a fraction of a second - i.e. the actual speed.

The last line of the output block gives the mean speed plus the standard deviation. This is for those who like to have concrete statistics.

 

 

You can save the output to file or you can print it.

If you wish, you can clear the output list before doing your next set of tests.

And you do your next set of tests by once more clicking the Start button.

 

And that is all there is to it

 

 

 

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