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Type: Posts; User: jbeale

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    All the files together are 603 MB, about one...

    All the files together are 603 MB, about one audio CD worth.
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    anyone want some very old R3D test images?

    About six years ago (Jan. 8 2008) I did some basic tests with Red #103 (firmware #12). I put up a description and some small R3D files on my website at...
  3. Thread: EPIC AFRICA

    by jbeale
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    Are there solar panel battery chargers small...

    Are there solar panel battery chargers small enough to carry, or is that impractical?
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    My information is that the annual turnover rate...

    My information is that the annual turnover rate for electronic product assembly labor in Shenzen is about 30%. It's a fast-paced market and people are chasing higher salaries- nothing wrong with...
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    I'm no expert, but if anyone is trying to roll...

    I'm no expert, but if anyone is trying to roll their own flocking solution, be aware that some types of velvet flocking can shed tiny black hairs over time. Not the sort of thing you want running...
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    pinhole lenses

    Pinhole cameras are usually not known for high resolution, and with f/64, etc. obviously lighting can be an issue. But it does (kind of) work, for example here is a DSLR video using a pinhole lens:...
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    beautiful image

    The image quality is really beautiful and crisp, even with the internet compression- nice job!
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    This has been discussed at length here and I...

    This has been discussed at length here and I don't know if I'm the right person to summarize, but my short answer is: on a DSLR with switchable pre-ADC gain stage, you can define native ISO as the...
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    How would that work? Do you have a design in...

    How would that work? Do you have a design in mind?

    My understanding is, th output of this device is a real image of its internal reticle, which comes to a focus at the correct distance for the...
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    as others have pointed out elsewhere, another...

    as others have pointed out elsewhere, another variable is the projector and its setup. I'm not clear on all the details but suffice it so say, it is possible to get a digital projector setup to make...
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    filtered tungsten light = more IR

    tungsten lights put out quite a bit more IR light than visible light. The IR/visible ratio goes up even more when you add filters, because most gels are nearly transparent in the IR even if they are...
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    I know that a polarizer can remove the sheen from...

    I know that a polarizer can remove the sheen from glossy leaves (or anything else shiny). Does shooting in 3D involve some polarization selectivity? If you are using a beamsplitter in front of your...
  13. Thread: Owners...

    by jbeale
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    they're all too busy with the real work...?

    In some sense this seems like the best complement anyway- right now, they're too valuable to just play with !
    (and, I suppose, the bar is now set so high that owners don't want to disappoint the...
  14. Not to hijack this thread, but I'm interested in...

    Not to hijack this thread, but I'm interested in what the behavior of Epic is in this situation (both what should happen, and what does happen)
  15. FPGA core loading time?

    I know nothing of what is inside the Red. But if they have a large FPGA (or more than one) then you just have to wait until they're programmed until they can start working, and that's the way it is....
  16. Thread: Tattoo 2(k)...

    by jbeale
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    in case you have out of sync sound...

    ...try using the latest version of your mp4 player. When I tried the 1k version, the sound was several seconds out of sync (ahead of picture), both in vlc and also Nero Showtime 4. However, I had an...
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    understanding lens resolution testing

    If I understand the test that is shown here, you can't forget about the lens, or OLPF filter, or the sensor, or the original chart for that matter. The graph shows a response which is the product of...
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    I notice user numbers have changed. I used to...

    I notice user numbers have changed. I used to have a bookmark to see Jim's most recent posts, but it didn't work with the restored site. The new bookmark for Jim's postings is below (used to be...
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    It's just another file write. Doesn't cause any...

    It's just another file write. Doesn't cause any more wear than would filling up the media with normal R3D files.
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    My Canon 50D doesn't record video, but it has an...

    My Canon 50D doesn't record video, but it has an HDMI output which works in "live view" mode. Looking at the HDMI output, it appears to be 30 fps at 1/30 sec shutter, which is certainly not the same...
  21. There are a number of programs out there now that...

    There are a number of programs out there now that generate resolution numbers based on digital images, for example Imatest- of course this is system measurement (lens + OLPF + sensor + processing). ...
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    you have some very nice shots in there- good job...

    you have some very nice shots in there- good job showing off the lens!
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    You can buy a complete Flip "UltraHD" camcorder...

    You can buy a complete Flip "UltraHD" camcorder for $200 that records 720p and it fits in your pocket and super easy & quick to use. I think there are some ND filters that cost more than this whole...
  24. more about Small vs. Big pixels

    The most careful and detailed exposition on digital camera image quality I have seen online is from Emil Martinec at the University of Chicago. Daniel, I wonder if you would agree with his comment...
  25. Wow! I'm still absorbing all this information,...

    Wow! I'm still absorbing all this information, but it looks like my "smaller sensors = worse performance, other things being equal" idea is well debunked here. I'd seen the original dpreview...
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