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sunyata

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  1. Like
    sunyata got a reaction from foliovision in The very underestimated problem of RADIOACTIVE lenses   
    from wikipedia, or course:
     
    Thorium dioxide was formerly added to glasses during manufacture to increase their refractive index, producing thoriated glass with up to 40% ThO2 content. These glasses were used in the construction of high-quality photographic lenses. However, the radioactivity of the thorium caused both a safety and pollution hazard and self-degradation of the glass (turning it yellow or brown over time). Lanthanum oxide has replaced thorium dioxide in almost all modern high-index glasses.
     
    and this:
     
     it was found to be a carcinogen, sometimes causing cholangiocarcinoma  (that is with respect to another use for thorium dioxide in the past, as an x-ray contrast agent).
     
    I'm not really concerned about 90% of my lenses, but I was just working on an old rangefinder lens, including taking apart the elements and removing fungus, so this is good to know. My main concern wouldn't be beta rays but just doing something stupid like shattering a lens trying to re-glue it or something. Not likely, but I'm going to check if thorium dioxide was used in glass before I work on it now. Thanks for the post junior.
  2. Like
    sunyata got a reaction from Geoff CB in Sony F5 hack unlocks 4K XAVC recording   
    guys, this applies to engines, whiskey, amplifiers, blu-ray players, vfx, lenses, monitor panels.. it's your job as DIY'ers, to find these imbalances, take the labels off, solder off the capacitors, hack the firmware, de-restrict the exhaust, snap the aperture rings... and keep it a secret: it's a good thing.
  3. Like
    sunyata got a reaction from vaga in The very underestimated problem of RADIOACTIVE lenses   
    from wikipedia, or course:
     
    Thorium dioxide was formerly added to glasses during manufacture to increase their refractive index, producing thoriated glass with up to 40% ThO2 content. These glasses were used in the construction of high-quality photographic lenses. However, the radioactivity of the thorium caused both a safety and pollution hazard and self-degradation of the glass (turning it yellow or brown over time). Lanthanum oxide has replaced thorium dioxide in almost all modern high-index glasses.
     
    and this:
     
     it was found to be a carcinogen, sometimes causing cholangiocarcinoma  (that is with respect to another use for thorium dioxide in the past, as an x-ray contrast agent).
     
    I'm not really concerned about 90% of my lenses, but I was just working on an old rangefinder lens, including taking apart the elements and removing fungus, so this is good to know. My main concern wouldn't be beta rays but just doing something stupid like shattering a lens trying to re-glue it or something. Not likely, but I'm going to check if thorium dioxide was used in glass before I work on it now. Thanks for the post junior.
  4. Like
    sunyata reacted to Don Kotlos in Sony A7S II is out!   
    Here is another example only to show that the codec and bitrate play a big role for banding . So when comparing footage is always crucial to match these. 
    Took a 10bit 4K GH4 sample, transcoded to 3 different 1080p, matched histograms (as close as I could) and graded with the same LUT. 
  5. Like
    sunyata reacted to TheRenaissanceMan in Great article   
    And most of the industry. https://vimeo.com/106153701

    Seriously dude, let it go. 4K is nice to have, not need to have. Compression, color depth, bit depth, DR, and color science matter much more.
  6. Like
    sunyata reacted to jagnje in Great article   
    4k 4k 4k Why is everybody so obsessed with this??? You think it will make you or your videos better?? All it will do is make you spend 4k€ on a computer that will make everything work smooth. 4k is a consumer thing for now...I will take a clean, flat moire and aliasing free prores footage with actual usable 10 stops of DR for the next 2 years at least over any kind of 4k. 
     
  7. Like
    sunyata reacted to Nikkor in Sony A7S II is out!   
    I had that marcie once to try out some stuff and the file was very nice to work with in photoshop. I think it's some raw negative scan, you tell me
  8. Like
    sunyata reacted to Nikkor in Sony A7S II is out!   
    I want a camera that renders like that kodak scan.
  9. Like
    sunyata reacted to Xavier Plágaro Mussard in Canon announces development of 8K Cinema EOS camera and 120MP DSLR   
    It's difficult to tell 2K from 4K in a theater, let alone in a tv. 8K is nowadays as useless as it can get, to me. And I am for progress. But better codecs and more ergonomic/better menus cameras would be more welcome, at least by me! 
    RAI, italian public television broadcasts in SD 4:3. 
  10. Like
    sunyata reacted to KarimNassar in Canon announces development of 8K Cinema EOS camera and 120MP DSLR   
    yeah well if they could get into a dynamic range and color depth war that would be great thanks.
    can't wait to get my compressed 8k 4:2:0 8 bit image. so exciting.
  11. Like
    sunyata got a reaction from benymypony in Pssst... free LUT calc tool over here:   
    Assuming you haven't seen this.. it looks like cameramanben has done something really useful here: he's compiled a ton of research and written a JavaScript LUT calculator tool released under a GNU freesoftware license (I think this is about as free as it gets). This could be used for 1D shaper LUT's, or 3D LUT's with gamma/gamut baked together - if that's more your thing - and even custom code value ranges. I think you can upload a sample image too. I see an A7s profile as well as Rec2020 gamut, DCI-P3 gamut... it's on github.
    Online tool: http://cameramanben.github.io/LUTCalc/LUTCalc/index.html
    Link to browser based apps: https://cameramanben.github.io/LUTCalc/
    Objective-C wrapper for MacOS: https://github.com/cameramanben/LUTCalc-For-Mac 
    He needs a donation button somewhere. 
     
  12. Like
    sunyata got a reaction from Zak Forsman in Pssst... free LUT calc tool over here:   
    Assuming you haven't seen this.. it looks like cameramanben has done something really useful here: he's compiled a ton of research and written a JavaScript LUT calculator tool released under a GNU freesoftware license (I think this is about as free as it gets). This could be used for 1D shaper LUT's, or 3D LUT's with gamma/gamut baked together - if that's more your thing - and even custom code value ranges. I think you can upload a sample image too. I see an A7s profile as well as Rec2020 gamut, DCI-P3 gamut... it's on github.
    Online tool: http://cameramanben.github.io/LUTCalc/LUTCalc/index.html
    Link to browser based apps: https://cameramanben.github.io/LUTCalc/
    Objective-C wrapper for MacOS: https://github.com/cameramanben/LUTCalc-For-Mac 
    He needs a donation button somewhere. 
     
  13. Like
    sunyata reacted to LimitBreak in Canon's new $30,000 video camera does only 1080p   
    The ME20F-SH is a low light capable video camera with photosites sized to 19 microns on it's 2.26 MP full-frame 35mm CMOS sensor to deliver an ISO equivalent of more than 4 million. The suggested retail price is $30,000
     
    I guess the A7s just got a little competition lol, will see how the cheaper A7sII will stack up in the Iso capabilities and real world low light performance. 
     
    http://www.engadget.com/2015/07/30/canon-me20f-sh/
    http://www.dpreview.com/articles/5496399487/canon-multi-purpose-me20f-sh-camera-reaches-iso-4-million
     
     
     
  14. Like
    sunyata reacted to richg101 in Slowest shutter speed in video mode   
    Sony allow as slow as 1/4sec at any frame rate.  shooting at 25p and 1/5th sec then speeding it up by 500% gives beautiful low light results for timelapse type stuff.  with the motion blur which is very pleasing for thing slike cars in the dark.  
    https://vimeo.com/52579247 
     
  15. Like
    sunyata got a reaction from Tim Fraser in How I would describe 1dc video quality   
    One of my favorite 35mm (film) rangefinders is the Olympus 35SP which is a fixed lens Zuiko 42mm 1.7, which has a Super 35 cine equivalent of 28mm. So if you want to take some Super 35 @ 28mm "cine" film photos for reference, get an Olympus 35SP and buy some hand rolled ECN-2 film.
  16. Like
    sunyata reacted to bamigoreng in "Untraditional" focal lengths with intention   
    Nice! Canon 7D sensor size - 22.3 x 14.9mm. Nikon D3100 - 23.1 x 15.4mm. 
  17. Like
    sunyata got a reaction from kaylee in "Untraditional" focal lengths with intention   
    updated the comparator, it is now "Il Comparatorre".. bigger pictures, updated layout. 
  18. Like
    sunyata reacted to Shield3 in How I would describe 1dc video quality   
    Quick link.  I know this is simple home video type stuff, but to me I like the look.
    4k 1dc file, built-in audio.
    https://drive.google.com/file/d/0B3W9u9cu-URWd2N4LWZzY2NkcXc/view?usp=sharing
     
    4k frame grab...

  19. Like
    sunyata got a reaction from Jonesy Jones in "Untraditional" focal lengths with intention   
    updated the comparator, it is now "Il Comparatorre".. bigger pictures, updated layout. 
  20. Like
    sunyata reacted to Axel in Too late for an a7s guide?   
    Yes, the Wolfcrow E-Book is $80, and though it may gather all information the author knew about at the time he first published it, he has very headstrong opinions, which imo don't help to get the best out of your camera.
    Me and my buddy are only testing the A7s since a month now or so. We have a lot of Canon glass, so we bought the Metabones adapter. Can't recommend it, because it turned out to be unreliable (aperture). We have a Sony Zeiss 16-35 and a Sigma 24-105 (imo the better one, 24mm is also wide enough), both E-mount of course. For faster primes, we are planning to buy some Rokinons, perhaps 50 + 85. 
    As I wrote before, I'm no friend of superflat PPs with an 8-bit codec. Try autumn leaves, and you will get better skin tones than with any SLog+LUT-treatment. But that's my strong opinion.
     
  21. Like
    sunyata reacted to Jonesy Jones in 70% of what you see...   
    So, I've heard that 70% of what you see in the movies is actually what you hear. I for one fully believe this. I have experienced this over and over both as a filmmaker and audience. With that said, I have just discovered this website http://www.sonniss.com/sound-effects/. Maybe you know of this already, but if not please check it out, it'll be worth your time. Amazing sound fx (and music beds) at VERY reasonable prices with simple and straightforward license. Can't believe I've never seen this before and I wanted to share. In my opinion, this has the potential to set you apart as a filmmaker, depending on what kind of productions you're into I guess. 
    Anyway, enjoy. 
  22. Like
    sunyata got a reaction from Xavier Plágaro Mussard in "Untraditional" focal lengths with intention   
    i didn't find that skyline photo in the comparator app very useful, so i hacked it (kinda, not really) and i added an A7s sensor profile. now it starts at 15mm because that was the example photo that i found, taken with the Sony SEL1080 10-18 at 15mm full frame with an A7s. will probably take down soon because i don't plan on re-writing the javascript, although it could use it. 
  23. Like
    sunyata reacted to TheRenaissanceMan in Controlling highlight saturation by luminance   
    I know this is completely unhelpful, but this makes me really happy I'm using DaVinci Resolve now.
  24. Like
    sunyata reacted to AaronChicago in Controlling highlight saturation by luminance   
    That looks like a good option. I figured out another way to identify super highlights in colorista with a key. Shadows didn't work out. I'll try your method for shadows.
  25. Like
    sunyata reacted to jgharding in Controlling highlight saturation by luminance   
    To do this easily and accurately it's best to round trip with Speedgrade.
    at the moment FCPX does this much more easily I'm afraid.
    Adobe would be wise to just pull the whole of Speedgrade correction into Premiere as a plugin or panel.
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