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Message |
    
Peregrine
Tinkerer
Username: Peregrine
Post Number: 6
Registered: 01-2013
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, June 14, 2013 - 05:57 am: | 
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www.lomography.com/magazine/tipster/2013/05/31/shutter-speed-tester-for-your-iph one
Don't know if this has been announced somewhere on the forum previously - apologies if it has.
The app costs £1.99 from iTunes & works fine as an audio-based tester, and superbly well with the optional light plug, which the young inventor, Lukas Fritz can supply, incl postage, for €16. I use it constantly to very good effect - highly recommended. In my view it is a ground breaking development which should enable not just better repairs and setting up of vintage cameras but their much better and more frequent use.
Lukas is trying to develop an Android app but variability in different phone specs. is making it difficult - any suggestions welcome.
Best regards
Richard |
Dcshooter
Tinkerer
Username: Dcshooter
Post Number: 13
Registered: 09-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, June 20, 2013 - 11:27 am: |
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Unfortunately, this is useless for Focal Plane shutter cameras. |
Mattthegamer463
Tinkerer
Username: Mattthegamer463
Post Number: 3
Registered: 06-2013
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, June 20, 2013 - 03:54 pm: |
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I think the optical attachment would work fine with a focal plane shutter, any point on the shutter will be open to light passing through the same amount as any other, so the readings should be fine. I built a device with a single sensor that measures the light duration and displays on a LCD, it is accurate down to 1/1000th with no issues. |
Dcshooter
Tinkerer
Username: Dcshooter
Post Number: 14
Registered: 09-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, June 21, 2013 - 07:34 am: |
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The author himself states that it is only accurate up to about 1/60 of a second for FPS, even with the optical attachement. |
Hanskerensky
Tinkerer
Username: Hanskerensky
Post Number: 256
Registered: 05-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, June 22, 2013 - 01:20 pm: |
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Strangely enough, that webpage mentioned by the OP contains a link to another page :
http://www.echolot-online.de/Shutter-Speed.html
Which seems to be made by Lukas Fritz himself. There he mentions that for SLR's you can go only till the flashsync speed because faster will not be recognised by the acoustic system.
However, IMO faster speeds should be recognised by going the optical way. Accuracy is of course another theme. This would greatly depend on shape, position and characteristics of the used sensor.
For SLR's it would be better to have at least 2 optical sensors, positioned near the start and the end of the curtain travel. Even better would be 3 so that also the middle of the filmgate would be visible in the measurement.
The measurement head (for 24x36mm filmframes) on my Kyoritsu Arrowin EF8000 even has 6 sensors, 3 for a vertical traveling curtain and 3 for a horizontal traveling curtain.
btw Just wondering if the iPhone has a stereo microphone input ? In that case 2 optical sensors could be used and that would make this system more versatile. |
