Shutter-Speed-Tester for the iPhone

[dave_whatever]

Looks like a great idea, well done for bringing this to market.

I was thinking though, given the iPhone already has a device capable of detecting light (the camera) can the app not be programmed to use that instead of the additional sensor?

[Lukas]

I thought about this at the beginning, but unfortunately it is not possible. The camera has a limited frame rate (about 30fps), so the theoretical fastest speed that could be measured would be 1/30s.

[Peter De Smidt]

I ordered one of the light sensors, and I'll buy and try the app when the sensor arrives.

[Tin Can]

Of course, duh!

I like your app and am glad I did not buy all the other shutter testers over the years.

I think many of us have pretty good ears for the slower speeds.

I thought about this at the beginning, but unfortunately it is not possible. The camera has a limited frame rate (about 30fps), so the theoretical fastest speed that could be measured would be 1/30s.

[fecaleagle]

Thanks for this... I purchased the app and will be ordering the photo-plug soon. I had a freeze the first time I attempted a recording and had to quit the app from task switcher on an iPhone 5. If it helps, my status bar turned red, indicating a recording (which I see it doesn't do when it works correctly), and the recording spinner just went on and on, although the timer never moved. I also have a feature request. I will use this to test my shutters, but I would also like to use it to check my bulb exposure timings. So for instance, I would like to be able to adjust the duration of the recording up to, say, 10 seconds, so I can check my accuracy on a 5-second bulb exposure.

Thanks for the app. I think you will find that there are more than a couple members here who will purchase it.

[Lukas]

The phototransistor-plugs are available again !
http://www.ebay.com/itm/Shutter-Spee...item3a825152b0

Yes, I will keep your suggestion to enable longer recording times in mind.

[Jim Graves]

I bought and have been trying out the app on my I-Phone (it's an early version 3G phone ... so later versions may vary.)

App works well and is quite easy to use after a few tries. I have four different versions of home shutter testers and this is by far the most convenient to use ... especially with the on-phone recording of readings and stop adjustments. Well worth the cost.

I tested it on a shutter I had professionally tested and it was right on up through 1/60. I had trouble discerning the exact open-close peaks at any higher speeds.

But I've had problems at higher speeds with all four testers I have.

I have ordered the photo transistor plug ... so I'm looking forward to measuring using light rather than sound. One quirk of a couple of photo transistor testers I have is that they seem to require a specific light level to be accurate so I'm curious to see if that is an issue with this system.

[Doremus Scudder]

Lukas,

I have the app and like it very much. It would be very helpful to me if in a future update you could provide the option to read shutter speeds in milliseconds instead of deviation from a chosen speed. That would be more convenient and more in line with what shutter speed readouts normally are.

Best,

Doremus

[Tin Can]

Just received the plug in light sensor.

Checking a reliable Pentax at 1/30 yielded 1/33.6.

Then using a LED flashlight 1/250 was 1/189th.

Isn't 20% considered the standard?

Aimed it a fluorescent lamp and it can read the AC sine wave!

Thanks Lukas!

[Jim Graves]

Randy ... curious to know how the speeds measured by sound and then by light compare.