Film camera shutter chronograph made with Arduino Nano.
🔏 This repo in not maintained. However, feel free to ask any questions through the issues, or fork it and make a better version by yourself.
The project was inspired by this article about measuring shutter speed of vintage Kiev-3 camera. Its author uses a laser, a phototransistor and an oscilloscope to manually measure the time interval of the shutter. You can see pictures of the entire pfocess and of measuring device itself.
I chose to use the BPW34 photodiode instead, the fastest I could find on the local market. And then I added LM393P comparator to make thing more digestible for Arduino.
The final scheme looks like this:
The code returns measuring results in milliseconds. You will need eRCaGuy_Timer2_Counter library to run it. Get it here.
It's recommended to repeat the measurement on each shutter speed at least three times.
Finally it's convenient to put results in a table like this:
| Model: Smena-8M | |||
| Serial No.: 178060 | |||
| No. | Symbol | Estimated duration, ms | Average measured duration, ms |
|---|---|---|---|
| 1 | 2 | 500 | |
| 2 | 4 | 250 | |
| 3 | 5 | 200 | |
| 4 | 8 | 125 | |
| 5 | 10 | 100 | |
| 6 | 15 | 66.7 | 79 |
| 7 | 25 | 40 | |
| 8 | 30 | 33.3 | 43 |
| 9 | 50 | 20 | |
| 10 | 60 | 16.7 | 24.5 |
| 11 | 125 | 8 | 12.4 |
| 12 | 250 | 4 | 4.8 |
| 13 | 500 | 2 | |
| 14 | 1000 | 1 | |
| 15 | 1250 | 0.8 | |
| 16 | 2000 | 0.5 |