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Alex Lobos

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    Sony A7s DIY 4K Recorder

    In: Cameras

    Posted

    According to the last reviewer on the BHphotoVideo page Inogeni 4K to USB3 converter works with A7S.
    But  USB3 output for 4K is only 4:2:0 8Bit while Sony A7S HDMI 4K feed is 4:2:2 8Bit, so there is some loss of color information.
    Specs on BHphotovideo page are not full, you can find the details here. 
    http://www.dexteralabs.com/inogeni/

    Hadrware requirements are Core i5 with 4Gb RAM. Pair it with MS Surface 1 or 2 and you get cheaper (under 1K) recorder than shogun but slightly bigger, heavier and of course without the nice screen and many recording options. Not sure if it is worth it. 

    Blackmagic has much cheaper (200$) PCI card for 4K capture if you are willing to use desktop computer. For me it's not viable option but here it is:
    https://www.blackmagicdesign.com/products/intensitypro4k

     

    ​For any of two solutions, the Inogeni converter, or the Blackmagic PCI card, wouldn't be any cheap PC solution? (battery powered or not) "Raspberry-Pi-like" or so?

    Sony A7s DIY 4K Recorder

    In: Cameras

    Posted

    Doubtful, power requirements too high / too much heat generated.  Panasonic can do 4K because they use smaller chips and a different sensor technology optimized for video, not photography.  

    ​Thanks for the explaination... that sounds so mysterious to me why a 'different sensor technology' would make such a change in heat and power needed when compressing/recording pixel information. :-O and while several samrtphones already record 4K.  ?
    About the power i wouldn't care to have a heavier battery, or several ones to change often, if i can record 4K. (my purpose is to make photos from video-frames in high-shutter speed, because of the subject moving fast and sereval reasons ( http://www.avsforum.com/forum/161-camcorders/1949529-any-cheap-4k-external-recorder-coming-sony-a7s.html ) 

    Sony A7s DIY 4K Recorder

    In: Cameras

    Posted

    Also... would thoses solutions record kind of 'raw' or 'compressed' on a HD? I'm quite unsure about all thoses video formats... I mean if it's 1Tb for each hour of video it's not gonna be practical to use 4K...

    Other question: Is it likely that Sony will come-up soon with a new version of this camera that can this time record the 4K video internally ?

    I'm wondering if it's better to buy this camera and wait to a cheap 4K recorder to come-up on the market, or if i should rather wait for a similar extremely sensitive camera that record 4K in candle light... but how long would we have to wait?

    Sony A7s DIY 4K Recorder

    In: Cameras

    Posted

    Nice.

    I'm also looking forward to buy this unique camera so sensitive to low light in video, to the condition that i can record 4k with it at a reasonable price...

    I just posted the question yesterday on dpreview: http://***URL removed***/forums/thread/3818206

    Also: Could this converter record 4K from the A7S ? -> http://www.bhphotovideo.com/c/product/1073122-REG/inogeni_4k2usb3_4k_hdmi_to_usb.html

    (but anyway it's usb3.0 , while my MBP i7 is only usb2, damn, i would probably have to buy another computer)

    And also i saw this card, wondering also if it would work with the A7S but hmm, still expensive, and i don't have a desktop computer: http://www.bhphotovideo.com/c/product/1044784-REG/blackmagic_design_bdlkstudio4k_decklink_studio_4k.html

    thanks

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