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wrong exposure time in Media Pro

Patrik2
Hello
the exposure time in media pro is not correct! When you use BULB Mediapro show you 1/-0 Sek in the metadata window. When you shoot with an 1/50 media pro show you 1/48 !?
Capture One and Bridge show the right exposure time.

Thanks for your help
Patrik
0

Comments

2 comments

Date Votes
  • Thomas Günther
    To get the exact values you need to read out the EXIF data with a tool like EXIFtool, which just exports the original values.
    In most applications odd values are rounded due to the fact that the number formats are easier to treat and using integers or bit values do need really less space in a database than double precision or values with higher precision.
    All my cameras do usually not exposure fractions like 1/50 and do not use f/stop with precise numbers if I extract the values stored inside the picture file - it is just "representation" in the DAM.

    Metadata allow a lot of value representation regarding speed and others:

    Portion of data of my Leica M8


    ---- ExifIFD ----
    ExposureTime: 1/60
    ExposureProgram: Aperture-priority AE
    ISO: 160
    ExifVersion: 0220
    CreateDate: 2013:01:29 14:24:02
    ShutterSpeedValue: 1/64
    ExposureCompensation: 0
    MaxApertureValue: 2.8
    MeteringMode: Center-weighted average
    LightSource: Unknown
    Flash: Auto, Did not fire
    FocalLength: 28.0 mm
    FileSource: Digital Camera
    SceneType: Directly photographed
    DigitalZoomRatio: 0
    FocalLengthIn35mmFormat: 38 mm
    SceneCaptureType: Standard
    ImageUniqueID: 00000000000000000000000000003c43
    ---- Leica ----
    UserProfile: User Profile 0 (Dynamic)
    SerialNumber: 3196860
    WhiteBalance: Auto or Manual
    LensType: Elmarit-M 28mm f/2.8 ASPH.
    ExternalSensorBrightnessValue: 3.44
    MeasuredLV: 5.26
    ApproximateFNumber: 3.0
    CameraTemperature: 16 C
    ColorTemperature: 0
    UV-IRFilterCorrection: Active
    CCDVersion: 0
    CCDBoardVersion: 1
    ControllerBoardVersion: 0
    M16CVersion: 0
    ImageIDNumber: 15427
    ---- Composite ----
    CFAPattern: [Red,Green][Green,Blue]
    ImageSize: 3920x2638
    LensID: Elmarit-M 28mm f/2.8 ASPH.
    ScaleFactor35efl: 1.4
    ShutterSpeed: 1/60
    CircleOfConfusion: 0.022 mm
    FOV: 50.7 deg
    FocalLength35efl: 28.0 mm (35 mm equivalent: 38.0 mm)


    Portion of data from my Canon 5D Mkii

    ExposureTime: 1/160
    FNumber: 4.0
    ExposureProgram: Aperture-priority AE
    ISO: 100
    ExifVersion: 0221
    DateTimeOriginal: 2013:01:01 01:23:14
    CreateDate: 2013:01:01 01:23:14
    ComponentsConfiguration: Y, Cb, Cr, -
    ShutterSpeedValue: 1/166
    ApertureValue: 4.0
    Flash: Off, Did not fire
    FocalLength: 50.0 mm
    ---
    ---- Canon ----
    ---
    CanonExposureMode: Aperture-priority AE
    LensType: Voigtlander or Carl Zeiss Lens
    MaxFocalLength: 50 mm
    MinFocalLength: 50 mm
    FocalUnits: 1/mm
    MaxAperture: 1.4
    MinAperture: 16
    ---
    AutoISO: 100
    BaseISO: 100
    MeasuredEV: 13.38
    TargetAperture: 4
    TargetExposureTime: 1/161
    ExposureCompensation: +2
    ---
    MeasuredEV2: 10
    BulbDuration: 0
    ---
    ---- Composite ----
    Aperture: 4.0
    DriveMode: Single-frame Shooting
    FileNumber: 100-4817
    ImageSize: 5616x3744
    Lens: 50.0 mm
    LensID: Carl Zeiss Distagon T* 18mm f/3.5 ZE + 2.8x
    OriginalDecisionData: (Binary data 608 bytes, use -b option to extract)
    PreviewImage: (Binary data 1714036 bytes, use -b option to extract)
    ScaleFactor35efl: 1.0
    ShootingMode: Aperture-priority AE
    ShutterSpeed: 1/160
    SubSecCreateDate: 2013:01:01 01:23:14.28
    SubSecDateTimeOriginal: 2013:01:01 01:23:14.28
    SubSecModifyDate: 2013:01:01 01:23:14.28
    ThumbnailImage: (Binary data 14204 bytes, use -b option to extract)
    WB_RGGBLevels: 2172 1180 1180 2340
    BlueBalance: 1.983051
    CircleOfConfusion: 0.031 mm
    FOV: 40.5 deg
    FocalLength35efl: 50.0 mm (35 mm equivalent: 48.8 mm)
    HyperfocalDistance: 20.30 m
    Lens35efl: 50.0 mm (35 mm equivalent: 48.8 mm)
    LightValue: 11.3
    RedBalance: 1.840678



    So it might be just a flow, because someetimes you do not know which value is really used for displaying reasons.

    Another funny thing is what the camera indicates about the used lens (marked blue)
    Carl Zeiss Distagon T* 18mm f/3.5 ZE (+ 2.😎
    but the lens I used was the
    Carl Zeiss Planar T* 50mm f/1.4 ZE
    so: 18*2.8 = 50,4 which seems to be correct - but 3,5/2.8 = 1,25 and not 1,4, which is the maximum aperture of the Planar.

    I have not checked other camera/lens combinations, but you might see that, regarding EXIF data every camera and lens is different - even camera from the same manufacturer are not using a unique set of in-camera metadata.
    Who in the world can build a consistent database out of such a mess of data!

    My assumption is that POne uses POne camera related metadata , and due to the fact that these data are called standards, they are not mandatory in use, but the underlying JFIF/TIFF specification is not mandatory in naming, content and calculation but nothing more than "a hint to manufacturers".
    So what you think looks like a bug, is just the indication, that the manufacturer of your camera uses different tags-names and entities as POne uses for their bodies.
    If I have the time, I will do a check on some Nikons and I am expecting that even with 5 different bodies a lot of possibilities will occur.

    saludos redondos -
    tom
    0
  • Patrik2
    I think the problem is, that Medio Pro read not the exposure time in the record. It does read the shutter speed. By bulp action is this every time zero. The actual record in media pro doesn't support Exposure Time in the media record 😭

    Cheer Patrik


    ---- ExifIFD ----
    Modify Date : 2013:02:28 00:48:09
    Exposure Time : 8.6
    F Number : 4.0
    Exposure Program : Bulb
    ISO : 1600
    Exif Version : 0220
    Date/Time Original : 2013:02:28 00:48:09
    Create Date : 2013:02:28 00:48:09
    Shutter Speed Value : 0
    Aperture Value : 4.0
    Exposure Compensation : 0
    Subject Distance : 0 m
    Metering Mode : Multi-segment
    Flash : Off, Did not fire
    Focal Length : 16.0 mm
    User Comment :
    Color Space : Uncalibrated
    Exif Image Width : 5184
    Exif Image Height : 3456
    Focal Plane Resolution Unit : inches
    File Source : Digital Camera
    Scene Type : Directly photographed
    Exposure Mode : Auto
    White Balance : Manual
    0

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