Preview only show first 10 pages with watermark. For full document please download

Shutter Speed Tester - Cheap Solution Using Your Computers Sound

   EMBED

Share

Transcript

Shutter Speed Tester - Cheap solution using your computers sound card, freeware program and a very simple device that you can build with parts from Radio Shack or an electronic parts store. Do a Google Search for "Audacity" - an excellent (free) or Oscilloscope software also works My set up. I use rubber bands to hold it to the camera and what ever is handy to hold the light up to the lens I use a open widow with sunshine .I found this to work great down to 1/15 sec after use a CFL/ fluorescent light bulbs for light DO not use CFL/ fluorescent light bulbs over 1/30 sec. Open the aperture fire the shutter and record the results. Phototransistor or cadmium-sulfide Photocell Light Camera Nothing Fancy and no circuit board just soldered together. Phototransistor i.e. BPW 40 (most will work), 4 to 5 K ohm Resistor, Mono-Plug 5.5mm, Battery holder I used 2 AA, switch on/off, and a box to put it all in. Note there are 3 ways here for test prob. They all work Note light so OR this what I use Note pattern on pc will be small/harder to read Plug to PC cadmium-sulfide photocell Or 12-inches of single strand hook-up wire (The source/Radio Shack) • 1-project box (The source/Radio Shack #2701801) • 1-3.5mm microphone jack (The source/Radio Shack) I use a old cord from PC to speaker cord and plug • 1-cadmium-sulfide photocell (sold in packs of 5) (The source/Radio Shack #276-1657) • 1-mono plug cable (The source/Radio Shack #4202420) just use old cord with 1/8” plug • I use this one and Insulated Test/Jumper Leads no soldering need Radio Shack # 278-1157 Turn the light on, switch the tester on, Plug the mic into the computer start Audacity program. Open the aperture hit the record fire the shutter and record the results. I took a digital picture of my computer screen I zoomed in to one of the spikes and you can see a nice square wave Than you can select just the square wave and measure the wave. The time is shown on the bottom. Measurement =.068209 sec which falls between 1/15 and 1/8 sec. Measurement Times Converted to Shutter Times 1/2 Seconds = .5 1/5 Seconds = .2 1/8 Seconds = .125 1/15 Seconds = .066 1/20 Seconds = .050 1/25 Seconds = .040 1/30 Seconds = .033 1/50 Seconds = .020 1/60 Seconds = .0166 1/75 Seconds = .0133 1/90 Seconds = .011 1/100 Seconds = .010 1/125 Seconds = .008 1/200 Seconds = .005 1/250 Seconds = .004 1/400 Seconds = .0025 1/500 Seconds = .002 1/1000 Seconds =.001 1/2000 Seconds =.0005