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Recent content by Dhr Foto

  1. Dhr Foto

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    Building Stuart Brown's shutter speed testing - inconsistency at higher speeds?

    Done. Just when I finished taking these photos, one of the lasers started misbehaving. I will order some new ones without the circuit board and try again. However: in the few weeks that it worked, it worked really well and the results are adequate enough to proceed. Featuring a Fischer Technik...
  2. Dhr Foto

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    Building Stuart Brown's shutter speed testing - inconsistency at higher speeds?

    @Niglyn Yup - that's what I figured out with the help from @ic-racer and @koraks . For a camera that I will be using as the "ground truth", the error currently sits at +0.09 stop at 1/1000 which is more than enough for my purposes. Minoltas I repair have an acceptable deviation of .5 stop at...
  3. Dhr Foto

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    Building Stuart Brown's shutter speed testing - inconsistency at higher speeds?

    Update! After some thorough procrastination, I started to work on the 3D model and had it printed by someone for a small fee. Here are some pictures of the new version. I soldered all of the components in place on a piece of single sided strip PCB. The screen with all of the cables going to...
  4. Dhr Foto

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    Minolta 85 mm f/1.7 fungus revival

    I may or may not have bought a very cheap 85 mm f/1.7 with fungus on the front element. This is the guide on the mflenses forum I will be following. I wanted to start this thread early, because I wanted to post the "before" images I made to make a more objective comparison. Images taken with a...
  5. Dhr Foto

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    Zeiss Ikon Box Tengor 56/2 CLA and X-sync mod

    Just put it through my shutter tester; I expected the shutter speed to be about 1/30, but the tester consistently hits 1/50 - 1/60. Could be optical effects, but that is pretty good to know.
  6. Dhr Foto

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    Zeiss Ikon Box Tengor 56/2 CLA and X-sync mod

    I bought a 56/2 a while ago. Upon receiving it, I noticed the viewing windows were dirty and the shutter was a bit creaky. Opening it up was really easy; there are just two screws on the long sides of the box. The rest of the camera is riveted in place and structurally cannot come apart any...
  7. Dhr Foto

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    Building Stuart Brown's shutter speed testing - inconsistency at higher speeds?

    I modified the prototype to have two pieces of thick black photo paper on both the laser and the sensor side. I poked a hole through both sides with a 0.8 mm pin in a 22 mm by 32 mm rectangle. I temporarily disabled both the left and right side and kept the middle laser for ease of testing...
  8. Dhr Foto

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    Building Stuart Brown's shutter speed testing - inconsistency at higher speeds?

    The above post has errors and text missing. A (reported) error prevents me from correcting it. The last paragraph should be: Which leaves me with the following conclusions: The tester shows proper relative time measurements by virtue of the straight slope and pulse testing; The tester has an...
  9. Dhr Foto

    FYI- We have migrated to a new webserver, any issues let us know.

    Trying to post in the following thread yielded console error: PHP: <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>500 Internal Server Error</title> </head><body> <h1>Internal Server Error</h1> <p>The server encountered an internal error or misconfiguration and was unable...
  10. Dhr Foto

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    Building Stuart Brown's shutter speed testing - inconsistency at higher speeds?

    @ic-racer Yup - that was the issue. The laser I use has a laser spot of 1 mm x 3 mm at 10 cm distance. Even though I used the smallest dimension, the lens was still large enough to capture the long sides as well. I double checked the math in both the code and my spreadsheet and things seem to be...
  11. Dhr Foto

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    Building Stuart Brown's shutter speed testing - inconsistency at higher speeds?

    No change after disabling the serial connection. I have only just now remarked that I am posting this in a thread about a specific shutter tester from Niglyn, completely barging through the discussion - I presumed this was a general "cheap shutter tester" thread. Sorry about that.
  12. Dhr Foto

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    Building Stuart Brown's shutter speed testing - inconsistency at higher speeds?

    This stuff ignited my interest in mechanical and electrical engineering (not my final field of interest though) but yeah, I have drawers full of the stuff - including the gray pieces you mention! It's on release. I guess interrupts could mess up the timings, but using a separate, different...
  13. Dhr Foto

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    Building Stuart Brown's shutter speed testing - inconsistency at higher speeds?

    That being said: I need some help with the interpretation of my results. I made a nice spreadsheet to visualize the results I obtained on some cameras, based on the definitions from Scantips. Here is a measurement for my X-700: Table shows the data manipulation, col G the measurement from the...
  14. Dhr Foto

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    Building Stuart Brown's shutter speed testing - inconsistency at higher speeds?

    That's a small display! That's also why I am adapting it to fit more info, since the original layout looked great but lacked some information. Regarding vertical shutters: if you mount the lasers in a diagonal fashion like me, you can use the tester for both horizontal and vertical shutters...
  15. Dhr Foto

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    Building Stuart Brown's shutter speed testing - inconsistency at higher speeds?

    I have built Stuart Brown's shutter speed tester and I'd like to confirm that everything works beautifully. I have included some images where you can see the breadboard prototype mounted to some Fischer Technik (a very European construction toy). It looks like a rat's nest of wires and...
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