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Alvaro Velloso

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About Alvaro Velloso

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    Sea Nettle
  • Birthday 11/18/1965

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  • Camera Model & Brand
    Nikon D-300
  • Camera Housing
  • Strobe/Lighting Model & Brand
    2 Ikelite DS-125
  • Accessories
  1. Hi everybody, I'm planning to do a kind of Microflash by myself if Carlos did not put it into production soon . Some improvements I would try: - 5.5V 1F super capacitor (rechargeable) instead of coin batteries. - Microprocessor for special strobe effects, like delays and multiple triggers. If I had the time I would implement S-TTL as well, but it is a lot of work. Kind regards, Alvaro
  2. Hi Again ! This is Carlos Villoch Microflash. http://wetpixel.com/forums/index.php?showtopic=42901&page=4 Kind regards, Alvaro
  3. Hello Harry, I'm doing the same movement from DS-125 to YS-D1s. I'm also moving from Aquatica D-300 to D-7100 (or anything more powerful before November 2014). I've been shooting manually for long time and I would like to move to TTL in some macro conditions. You said: "The only real downside that I see is the increased drain on the camera battery" I saw somewhere (sorry!) a circuit that goes on the camera's bulkhead that triggers 2 leds through the housing optical bulkhead. I'm not sure it is a TTL converter as well or just a standard optical trigger. It would save you battery life. It works like S&S one, without TTL http://www.backscatter.com/learn/article/article.php?ID=178 Best wishes ! Alvaro
  4. Hi all, I finally found what I was looking for. Not need to hack it anymore. The protocol is a little bit more complex than I expected, but still feasible to implement. http://cms.diodenring.de/de/electronic/microcontroller/110-ittlanalysis http://off-the-clock.timothy-nicole-marks.com/computers-and-electronics/nikon-flash-analysis I'm developing a strobe with special features and this protocol may be a good adition in the future. All the best, Alvaro
  5. Hello, Excellent job. Any ideas to increase pulse width up to 20ms (1/50)? I can use a small macroprocessor for doing it. Cheers, Alvaro
  6. Hello, do you know where I could find iTTL specifications for Nikons? Cheers !
  7. Hi everyone, I'm an electronic engineer and I'm used to develop gadgets for my personal use. I had developed prototypes of strobes, sensors, triggers, flashlights and some software. One of this products, never seen before, needs a small UW housing to be developed and prototyped. The costs involved on this development are prohibitive in my country and I'm looking for make it feasible somewhere else. The final product would looks like an regular UW Strobe (Inon Z-240). I'm not experienced on the technology involved on this housing, and I'm assuming to be a kind of plastic injection or acrylic modeling. The electronic part of the project is already done, and I have tested it with relative success. I'm looking for someone who would like to invest lots of time on this housing prototype, aiming the benefits of a future production. The general plan would be: a) Choose best/cheapest technology for this prototype development (plastic, acrylic) b) Choose components: Connectors, clamps, wires c) 3D modeling / printing d) Prototype/Optimization e) Field Test f) Small production I'm reachable by alvaro.godinho.velloso@gmail.com and I can present my ideas. Thanks a lot, Álvaro Velloso
  8. Hi, Thank you all for helping me. I'm still searching the web about iTTL protocol. I didn't find it yet, but I found some interesting things I would share with you. Check out what hackers can add to your firmware: - RGB curves, like Canon 5-D does - Kelvin temperature - ISO 100, 6400 - Remote control improvements - Fast shutter speed - Color profiles - Larger Color spaces - Infrared shots - Cropping - Filtering - Masking There are also some easter eggs to enable special features (without firmware change). I found some pay-a-hack groups, sharing a budget for ordering a special feature. They were paying 20$ each. I'm a D-70 user, and I would be really interested on curves The search goes on....
  9. Hi Alex, I was looking for iTTL protocol details, but now I see it has to be cracked first. I think this kind of information should be shared by the manufacturer, saving OEM engineer's time. I can try do crack this protocol, but I have to buy an expensive Logic Decoder first, and it's not feasible for me now. If you find this information somewhere, please let me know. Have a great 2007 !
  10. Hi Bart, I do appreciate your answer, thanks a lot. I'm not sure, but probably we can get more information from the camera rather than Trigger/Quench signals. If there's only Trigger/Quench signals, why do Nikon and Canon use different names to identify their own protocols (eTTL and iTTL) ? Please check this devices: (go "Converter for iTTL", left menu) http://www.heinrichsweikamp.net/blitz/indexe.htm I'm myself doing some experiments reading Trigger/Quench times and delivering proper light to an external strobe (basic TTL protocol), but I suppose there's more information I can get from the camera. Best wishes, Alvaro
  11. Hi all, Does someone knows where I can get iTTL protocol spacifications ? I'm talking about low level communication between the camera and an external flash unit. I want to understand how I can get information about ISO, aperture, focus distance etc by the camera bulkhead. Great 2007 to everybody !
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