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rawhead
Joined: 09 Feb 2009
Posts: 1525
Location: Boston, MA
Expire: 2014-04-29
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 Posted: Sun Jul 05, 2009 2:30 pm Post subject: Accurately measure your slower shutter speeds. |
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rawhead wrote:
Here's a different kind of "technique". Ever need to test the accuracy of your camera's shutter speed? Perhaps when you're listing an item on Ebay?
I've found a fairly accurate way of measuring the accuracy of, as least the slower shutter speeds, down to 1/8s or maybe 1/15 or so.
Basically, you use your computer and a software that can record sound and display waveforms, and make recordings of the shutter sounds of your camera.
I use an app called Sound Studio on my Mac. Then, select the waveform that corresponds to the shutter sound, making sure you select from the original "attack" of the mirror flap/shutter opening up to the point the shutter closes. The length of the selection is your actual shutter speed. Here, I selected a waveform corresponding to 1/4s on my Pentacon Six TL. You can see it's pretty accurate (note where it says Length: 0'00.244).
This won't work for the faster shutter speeds, as it becomes increasingly difficult to tell apart the actual shutter opening/closing from all the other noises (mirror flap, etc.)
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Last edited by rawhead on Sun Jul 05, 2009 2:45 pm; edited 1 time in total |
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Orio
Joined: 24 Feb 2007
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Location: West Emilia
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| Posted: Sun Jul 05, 2009 2:35 pm Post subject: |
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Orio wrote:
Thanks, very clever!
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GrahamNR17
Joined: 17 Jan 2009
Posts: 1855
Location: Norfolk, UK
Expire: 2012-09-06
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| Posted: Sun Jul 05, 2009 2:55 pm Post subject: |
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GrahamNR17 wrote:
I am going to try my hand at something similar, but a little more sophisticated. I followed what Jesito had to say on his site and followed the links to the instructions. Worth taking a look. |
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Attila
Joined: 24 Feb 2007
Posts: 57864
Location: Hungary
Expire: 2025-11-18
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| Posted: Sun Jul 05, 2009 5:12 pm Post subject: |
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Attila wrote:
| GrahamNR17 wrote: |
| I am going to try my hand at something similar, but a little more sophisticated. I followed what Jesito had to say on his site and followed the links to the instructions. Worth taking a look. |
Smart thanks!
Where is the link GRaham ?
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visualopsins
Joined: 05 Mar 2009
Posts: 10690
Location: California
Expire: 2025-04-11
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| Posted: Sun Jul 05, 2009 6:00 pm Post subject: |
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visualopsins wrote:
Excellent rawhead!
Just add a few inexpensive parts to extend range ( http://www.geocities.com/Yosemite/2131/shspeed.html )
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rawhead
Joined: 09 Feb 2009
Posts: 1525
Location: Boston, MA
Expire: 2014-04-29
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| Posted: Mon Jul 06, 2009 5:56 am Post subject: |
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rawhead wrote:
Oh, beautiful!! I knew there must be a smarter/more accurate way of doing this!!! Thanks!! 
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Sony α7R, Pentax 67II, Kiev-60, Hasselblad 203FE, 903SWC, Graflex Norita 66, Mamiya M645 1000s, Burke & James 8x10, Graflex Pacemaker Speed Graphic (4x5 and 3x4), Century Graphic (2x3), R.B. Graflex Seried D, Rolleiflex SL66E, Rolleiflex 2.8C Xenotar, Mamiya C330f, a few M42, six P6, three OM, four Hasselblad, two Pentax 67, two Mamiya 645, one Noritar, and a sprinkle of EF. Oh, and an Aero Ektar and Leica Noctilux |
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rawhead
Joined: 09 Feb 2009
Posts: 1525
Location: Boston, MA
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| Posted: Mon Jul 06, 2009 6:02 am Post subject: |
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rawhead wrote:
The link given by siriusdogstar gave me another idea that might work, provided you have serious money to burn (obviously not for this alone 
Specifically, you can buy one of these Casio Exilims:
http://www.electronista.com/articles/09/01/07/casio.at.ces.2009/
and shoot video of your shutter, close up, with a light source on the other side. Count the number of frames w/ light, divide by 1,000, you got your shutter speed (x/1000s)
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Sony α7R, Pentax 67II, Kiev-60, Hasselblad 203FE, 903SWC, Graflex Norita 66, Mamiya M645 1000s, Burke & James 8x10, Graflex Pacemaker Speed Graphic (4x5 and 3x4), Century Graphic (2x3), R.B. Graflex Seried D, Rolleiflex SL66E, Rolleiflex 2.8C Xenotar, Mamiya C330f, a few M42, six P6, three OM, four Hasselblad, two Pentax 67, two Mamiya 645, one Noritar, and a sprinkle of EF. Oh, and an Aero Ektar and Leica Noctilux |
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Jesito
Joined: 24 Aug 2007
Posts: 5745
Location: Olivella, Catalonia, (Spain)
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| Posted: Mon Jul 06, 2009 2:01 pm Post subject: |
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Jesito wrote:
| GrahamNR17 wrote: |
| I am going to try my hand at something similar, but a little more sophisticated. I followed what Jesito had to say on his site and followed the links to the instructions. Worth taking a look. |
Graham, are you referring to this thread?: http://forum.mflenses.com/the-shutter-speed-meter-project-t11387.html
Peterqd was able to build a better shaped one than my prototype, using the output to feed an audio editing program (I used Audacity).
More precise than the sheer audio one,
Regards,
Jes.
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GrahamNR17
Joined: 17 Jan 2009
Posts: 1855
Location: Norfolk, UK
Expire: 2012-09-06
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| Posted: Mon Jul 06, 2009 6:35 pm Post subject: |
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GrahamNR17 wrote:
| Jesito wrote: |
| GrahamNR17 wrote: |
| I am going to try my hand at something similar, but a little more sophisticated. I followed what Jesito had to say on his site and followed the links to the instructions. Worth taking a look. |
Graham, are you referring to this thread?: http://forum.mflenses.com/the-shutter-speed-meter-project-t11387.html
Peterqd was able to build a better shaped one than my prototype, using the output to feed an audio editing program (I used Audacity).
More precise than the sheer audio one,
Regards,
Jes. |
Yes, that was the thread. I'll give both a go, it looks like a great way to pass a Sunday afternoon |
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