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Question to anamorphic fans
  • Vitaliy_KiselevVitaliy_Kiselev
    I need to know that aspect ratios do you need in hdmi connected LCD monitor to be totally happy.

    May be some other features, like aspect overlays, etc?
  • 18 Replies sorted by
  • EOSHDEOSHD
    Aspect overlays or grid lines would be useful for those cropping to cinemascope without an anamorphic.

    Also live-view scaling to 1920x820 (2.35:1), 1920x720 (2.66:1) and 1920x540 (3.55:1) would be great for MJPEG mode (I remember this was possible with the GH1 hack). Those are the main aspect ratios I use for anamorphic shooting.

    At the moment I am using the anamorphic scaling of the Zacuto EVF.
  • oscillianoscillian
    I don't own any anamorphic lenses, but I would enjoy a soft matte in 2.39:1 aspect ratio on both the evf and the lcd (hdmi out) with a 50-100% gray overlay (no gridlines as it is easier to compose with a true visual crop), or (if possible) a hard matte which uses a wider part of the sensor and maybe lowers the bitrate?
  • lolololo
    yeap for those cropping in post, like me, i would prefer the gridlines with safe margins and gridlines with no safe margins, on the three scales that EOSHD says, on the liveview (not on the composite), that way i will be able to compose a better frame, and later in post i will be able to do small digital tilts if i want to (:
  • MarkVMarkV
    Vitaliy this would be one of the dealbreakers! .. 1.85:1, 2.35:1, 2.39:1 gridlines on LCD and HDMI output would be perfect for framing and later croping in post.. + safe margins (as lolo said) would be cool too ...
  • v10tdiv10tdi
    As an idea only...

    What about different choices for the ExTele option? So in addition to 1:1 crops of 1920x1080, ExTele offers other 1:1 choices: 1920x820, 1920x720, 1920x540, etc...

    Maybe even make it configurable.
  • LPowellLPowell
    The precise digital scaling for widescreen HD is 1920x810, a 2.37:1 aspect ratio. This is derived from the 2560x1080p (aka 21:9) resolution used in the Philips and Vizio Widescreen Cinema displays:

    http://www.engadget.com/2011/01/04/vizio-bringing-21-9-cinema-hdtv-to-ces-with-2560-x-1080-resoluti/

    Traditional 2.35:1 and 2.39:1 aspect ratios were based on analog anamorphic cinemascope crops of 35mm film frames. The exact ratio varied and was never formally standardized.

    The digital 2:37:1 ratio was produced by cubing the standard 1.33x anamorphic ratio used in HDV videotape (1440x1080). This 4/3 ratio links the evolution of modern video frame sizes:

    SDTV - 4:3 aspect ratio - 640x480 (in square pixels)
    HDTV - (4:3)^2 ratio - 1920x1080
    Cinemascope - (4:3)^3 - 2560x1080
  • mattcmattc
    Would be great if the LCD monitor could account for different anamorphic compression strengths -- 2x, 1.75X, 1.5X, and 1.33x -- to arrive at AR of 2.37:1.


    Maybe this is useful:

    1.78:1 used with 1.33x lens gets you approx. 2.37:1.

    1.58:1 with 1.5x lens gets you approx. 2.37:1.

    1.37:1 with 1.75x lens gets you approx. 2.37:1

    1.19:1 with 2x lens gets you approx. 2.37:1.

    So, good and helpful aspect ratios include 1.19:1, 1.33:1 (4x3), 1.37:1, 1.58:1, 1.78:1 (16x9), 1.85:1 (Academy), 2.0:1 (Univisium -- probably most versatile), 2.37:1, 2.66:1, 3.55:1.


    Perhaps others have more suggestions ...
  • stoneystoney
    +1 with @LPowell. 1920x810 is a must... Please!!!
  • Vitaliy_KiselevVitaliy_Kiselev
    I think you don't get me fully.
    I mean support of aspect rations by external LCD monitor firmware :-)

    GH2 modifications are also interesting, of course.


    Thanks for answers.

  • LPowellLPowell
    @Vitaliy_Kiselev
    The most consistent way that LCD monitor firmware could support multiple aspect ratios is by applying the 4:3 (1.33X) factor to generate each wider step in aspect ratio:

    SDTV - 4:3 aspect ratio = 1.33:1
    HDTV - 16:9 (4/3 * 4/3) = 1.78:1
    Cinemascope - 64/27 (4/3 * 4/3 * 4/3) = 2.37:1
  • Vitaliy_KiselevVitaliy_Kiselev
    @LPowell
    I specially asked about more weird ratios :-)
  • LPowellLPowell
    @Vitaliy_Kiselev
    Here's a link to the Rosetta Stone of vintage widescreen cinema formats:

    http://www.widescreenmuseum.com/widescreen/aspectratio.htm
  • NickBenNickBen
    http://www.ce.org/Press/CurrentNews/press_release_detail.asp?id=12138

    CEA proposing standard for 21:9 displays today.

    Anybody know the exact resolution of 21:9 and best way to futureproof shooting with GH2?
  • LPowellLPowell
    @NickBen
    "21:9" is just an industry marketing term, it's only an approximation of the actual aspect ratio used in the Philips and Vizio widescreen displays. The exact resolution is 2560x1080, which is 64:27 or 2.37:1.

    If you render your widescreen footage at 1920x810 resolution, it will fit the width of current HDTV's and can be upscaled by 4/3rds ratio to precisely 2560x1080. Alternately, if you shoot with an anamorphic lens at 1920x1080, you can stretch and crop the footage to 2560x1080, and then downscale it to 1920x810 for HDTV display.
  • mattcmattc
    @NickBen
    Best futureproof AR is 2.0:1 as virtually all others can be extracted from it.

    Long thread but interesting explanation here http://reduser.net/forum/showthread.php?60740-4K-2-1...&highlight=univisium

    and also

    http://www.cinematography.net/Files/univision.pdf
  • NickBenNickBen
    @LPowell

    I like the look of 1920 x 810, I'll try it on my next project.
    Thanks for the tip.

    I'd love to have those gridlines on the GH2 display.
  • MarkVMarkV
    for the 2:1 .. as Panasonic GH user and RED user.. I have to agree with Jim here.. I love the 2:1 on EPIC-M! That's just the default AR for me now..
  • RobertoRoberto
    @vitaliy
    >I mean support of aspect ratios by external LCD monitor firmware

    Unsqueezed 2.3x:1 from 16:9
    Unsqueezed 2.3x:1 from 1.33:1

    one push-button, toggle aspects, thank you.

    That would make me a very happy man.
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