Thread: Just in case you were wondering how accurate ISO 800 is on Dragon...

Reply to Thread
Page 1 of 3 123 LastLast
Results 1 to 10 of 24
  1. #1 Just in case you were wondering how accurate ISO 800 is on Dragon... 
    Moderator Evin Grant's Avatar
    Join Date
    Dec 2006
    Location
    SoCal
    Posts
    4,336
    I decided to do a quick and dirty ISO verification of my Dragon last night, simple setup using a 500W Lowel Omni and a Macbeth chart.
    This is obviously tungsten only and I'll try to do a sunlight and HMI test as well but it may take a week or so.

    Notes:

    Lens used was a 50mm f1.8(T1.9) AFS-G Nikkor so I could show the displayed stop on the 5" touch. (any discrepancy at f8 between the f & T stop is under 1/10 stop and within the margin of error of this test.)

    The 18% chip exposure was verified by a Sekonic incident and Minolta spot meters (see pic) as well as the "video" exposure mode and a Zebra set to 41-43 IRE.

    The frame grab was made in RC3/RG3 but was the same result in RLF.

    This is only a reference to 18% grey placement as it relates to the indicated ISO, all other tone placements above and below will be determined by the curve in use.

    "All art is deception."

    My DP reel...
    http://www.evingrantdp.com
    360º Cinematography and camera rigs...
    http://www.360dop.com
    Reply With Quote  
     

  2. #2  
    Senior Member
    Join Date
    Jul 2010
    Location
    Stamford CT
    Posts
    3,178
    thanks for the test! obviously much appreciated!
    DIT, Assistant Editor, Phantom Tech, offering workflow services from acquisition to post

    Available with or without following gear:

    2 Alexa Studios
    Alexa M package
    Arri Amira Premium/UHD
    Alexa Mini with raw, 4/3
    Epic W package
    Oconnor 2060


    Red Rocket X with rMBP, FCPX, Avid MC8, and Resolve Lite 14 in the NYC/CT area.


    https://vestadalux.com
    Reply With Quote  
     

  3. #3  
    REDuser Sponsor Martin Stevens's Avatar
    Join Date
    Jan 2007
    Location
    Massachusetts
    Posts
    1,852
    Great info Evin!
    Regards,
    Martin Stevens

    President and Founder of Glidecam Industries, Inc.
    Producer and Director at Metaphoric Pictures Corporation.
    Reply With Quote  
     

  4. #4  
    Banned
    Join Date
    Oct 2008
    Location
    Montréal, Canada
    Posts
    634
    Thanks. That's good to see
    Reply With Quote  
     

  5. #5  
    Senior Member Kwan Khan's Avatar
    Join Date
    Jan 2008
    Location
    NYC
    Posts
    3,690
    Thanks for sharing
    No, I do not RENT MY GEARS... - NYC (Times Square)

    EPIC-D with 9" touch, 4 RAVENs, RPP, Sigma 18-35 PL, Motion Mount, VF/RED-rock wireless FF, Pana 17", JVC 20", Seadicam with SEGWAY, Letus 4-Axis with L'Aigle Exoskeleton.

    Trash-Can 12-core Max'd-out) +MBP (Retina), RED Rocket (Sonnet), RAID system (Promise Pegasus II), Adobe Production (CC), FCS2, Resolve 12 with MC Color, 50" 4K Panel
    Reply With Quote  
     

  6. #6  
    Senior Member
    Join Date
    Dec 2009
    Location
    Hollywood, USA
    Posts
    6,017
    Quote Originally Posted by Evin Grant View Post
    I decided to do a quick and dirty ISO verification of my Dragon last night, simple setup using a 500W Lowel Omni and a Macbeth chart.
    I've often said that I think the standard Macbeth chart is worthless in an all-digital world. It had a meaning in a photochemical film lab, but not for digital.

    If you're trying to measure exposure, get the DSC Labs grayscale chart:



    I much, much prefer a greyscale chart to a chart with random chips of color paints that have no bearing on modern-day camera chips. The DSC people are pretty sharp.
    marc wielage, csi • colorist/post consultant • daVinci Resolve Certified Trainer
    Reply With Quote  
     

  7. #7  
    Moderator Evin Grant's Avatar
    Join Date
    Dec 2006
    Location
    SoCal
    Posts
    4,336
    Quote Originally Posted by Marc Wielage View Post
    I much, much prefer a greyscale chart to a chart with random chips of color paints that have no bearing on modern-day camera chips.
    I wasn't using the color chips, just the 18% grey chip. With the backup from both the incident and spot measurements I can say with certainty that chip is accurate.
    The rest of the chart is of limited use I agree, but it is a known quantity and that gives it some bearing as a reference outside the particular electro-optical system you may be testing.

    The truth is I couldn't find my 15 year old Kodak grey card and I'm not sure I'd trust it at this point anyway.
    "All art is deception."

    My DP reel...
    http://www.evingrantdp.com
    360º Cinematography and camera rigs...
    http://www.360dop.com
    Reply With Quote  
     

  8. #8  
    REDuser Sponsor Martin Stevens's Avatar
    Join Date
    Jan 2007
    Location
    Massachusetts
    Posts
    1,852
    Quote Originally Posted by Evin Grant View Post
    I wasn't using the color chips, just the 18% grey chip. With the backup from both the incident and spot measurements I can say with certainty that chip is accurate.
    The rest of the chart is of limited use I agree, but it is a known quantity and that gives it some bearing as a reference outside the particular electro-optical system you may be testing.

    The truth is I couldn't find my 15 year old Kodak grey card and I'm not sure I'd trust it at this point anyway.
    Whoa. I have a gray card from 1982. Perhaps I should toss it. :)
    Regards,
    Martin Stevens

    President and Founder of Glidecam Industries, Inc.
    Producer and Director at Metaphoric Pictures Corporation.
    Reply With Quote  
     

  9. #9  
    REDuser Sponsor Gunleik Groven's Avatar
    Join Date
    Dec 2006
    Location
    Norway
    Posts
    13,258
    Thanks Evin!
    Life is good. So is RED...


    http://quine.no
    Reply With Quote  
     

  10. #10  
    Senior Member KETCH ROSSi's Avatar
    Join Date
    Jan 2007
    Location
    ITALY | USA
    Posts
    14,278
    Nicely done Evin!
    Filmmaker | Conservationist | Philanthropist
    ____________________________________________



    Reply With Quote  
     

Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts