Running LED array is one option.
How do you test the shutter speed of a digital camera?
How do you test the shutter speed of a digital camera?
Proprietary test software. The digital camera already has the sensor, so very easy for test software to monitor when a single pixel sees and does not see light.
As modern cameras are microprocessor controlled, running on a very accurate clock, they can test themselves.
The only simple way that I can think of is a row of LEDs. Each one lights for 1/30s before extinguishing and the next in series turns on.
At a shutter speed of 1/30s, one should see 1 or 2 LEDs lit. Any more and the shutter would be slower than 1/30s.
Next run the LEDs at 1/60s. Again at a shutter speed of 1/60s one should see 1 or 2 LEDs lit.
This can be continued through all the shutter speeds.
Very easy to make, probably £5 in parts or just bits from the scrap-box.
If anyone has any better ideas, I'm happy to have a go at building it.
Some light reading on the subject.
The Way to Modern Shutter Speed Measurement Methods: A Historical Overview - PMC
Exposure time is a fundamental parameter for the photographer when the photo is composed, and the exact length of the exposure may be an essential determinant of performance in certain camera-based applications, e.g., optical camera communication ...www.ncbi.nlm.nih.gov
But then the shutter is going away in digital camera so it may not be relevant much longer. I wonder now if we can get our hands on those Kyoritsu shutter testers as repair shops for film cameras close down.
I think testing a digital camera shutter is mist easily done taking photographs of an evenly lit surface. You can see tapering as a gradient and test speed via reciprocity. Microprocessor timed low speeds probably won't be off. So just compare high speeds to the slow speeds with a wider aperture or compensated light source.Proprietary test software. The digital camera already has the sensor, so very easy for test software to monitor when a single pixel sees and does not see light.
As modern cameras are microprocessor controlled, running on a very accurate clock, they can test themselves.
The only simple way that I can think of is a row of LEDs. Each one lights for 1/30s before extinguishing and the next in series turns on.
At a shutter speed of 1/30s, one should see 1 or 2 LEDs lit. Any more and the shutter would be slower than 1/30s.
Next run the LEDs at 1/60s. Again at a shutter speed of 1/60s one should see 1 or 2 LEDs lit.
This can be continued through all the shutter speeds.
Very easy to make, probably £5 in parts or just bits from the scrap-box.
If anyone has any better ideas, I'm happy to have a go at building it.
Some light reading on the subject.
The Way to Modern Shutter Speed Measurement Methods: A Historical Overview - PMC
Exposure time is a fundamental parameter for the photographer when the photo is composed, and the exact length of the exposure may be an essential determinant of performance in certain camera-based applications, e.g., optical camera communication ...www.ncbi.nlm.nih.gov
I think testing a digital camera shutter is mist easily done taking photographs of an evenly lit surface. You can see tapering as a gradient and test speed via reciprocity. Microprocessor timed low speeds probably won't be off. So just compare high speeds to the slow speeds with a wider aperture or compensated light source.
Did any one here get this one? I checked and this listing is gone now. I think you can still order a new one from C.R.I.S. but it might be around $5,000.But then the shutter is going away in digital camera so it may not be relevant much longer. I wonder now if we can get our hands on those Kyoritsu shutter testers as repair shops for film cameras close down.
If you're just going to buy a motor and attach a cardboard disk, then you somehow need to know ( accurately ) how fast that's spinning. With a record player, at least it's designed to be pretty accurate. How would you measure the rpm of your motor & disk ?
You got me thinking now, though how to use my digital camera and my turntable, set to 45rpm , to test a new LF lens shutter.
The speed of motors operates off the 50 HZ or 60HZ power input from the electric utility. It's fairly accurate but I'm not sure how much. Maybe others here know?.
I can think of a lot of places this would come in handy.
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