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Thread: Enquiry (K7 photo)

  1. #1

    Default Enquiry (K7 photo)

    For the past few months i noticing some noise (i dont knw its call noise or distortion) in certain photos i captured, especially in some low light situation.

    I dont know is it normal or someproblem with the K7 or lens, (but i think is user problem problem) the purpose of this thread is to get the confirmation so i can RMA the parts before warranty ended this march.

    Please check the photos below.

    Without flashhttp://tinypic.com/r/24uydxg/7

    Filename - IMGP5580.JPG
    Make - PENTAX
    Model - PENTAX K-7
    Orientation - Top left
    XResolution - 300
    YResolution - 300
    ResolutionUnit - Inch
    Software - K-7 Ver 1.10
    DateTime - 2011:02:12 23:31:25
    Artist - Edison
    YCbCrPositioning - Co-Sited
    Copyright -
    ExifOffset - 694
    ExposureTime - 1/50 seconds
    FNumber - 4.50
    ExposureProgram - Not defined
    ISOSpeedRatings - 800
    ExifVersion - 0221
    DateTimeOriginal - 2011:02:12 23:31:25
    DateTimeDigitized - 2011:02:12 23:31:25
    ComponentsConfiguration - YCbCr
    ExposureBiasValue - 0.00
    MeteringMode - Spot
    Flash - Flash not fired, compulsory flash mode
    FocalLength - 30.63 mm
    FlashPixVersion - 0100
    ColorSpace - sRGB
    ExifImageWidth - 4672
    ExifImageHeight - 3104
    InteroperabilityOffset - 54456
    SensingMethod - One-chip color area sensor
    FileSource - Other
    SceneType - Other
    CustomRendered - Normal process
    ExposureMode - Auto
    White Balance - Auto
    FocalLengthIn35mmFilm - 46 mm
    SceneCaptureType - Standard
    Contrast - Normal
    Saturation - Normal
    Sharpness - Normal
    SubjectDistanceRange - Distant view

    Maker Note (Vendor): -
    Mode - Auto
    Quality - 5
    ISO - 800
    White Balance - Auto
    Lens Type -

    Thumbnail: -
    Compression - 6 (JPG)
    XResolution - 300
    YResolution - 300
    ResolutionUnit - Inch
    JpegIFOffset - 54580
    JpegIFByteCount - 6962



    With flashhttp://tinypic.com/r/15xsme9/7

    Filename - IMGP5581.JPG
    Make - PENTAX
    Model - PENTAX K-7
    Orientation - Top left
    XResolution - 300
    YResolution - 300
    ResolutionUnit - Inch
    Software - K-7 Ver 1.10
    DateTime - 2011:02:12 23:31:49
    Artist - Edison
    YCbCrPositioning - Co-Sited
    Copyright -
    ExifOffset - 694
    ExposureTime - 1/50 seconds
    FNumber - 4.50
    ExposureProgram - Not defined
    ISOSpeedRatings - 800
    ExifVersion - 0221
    DateTimeOriginal - 2011:02:12 23:31:49
    DateTimeDigitized - 2011:02:12 23:31:49
    ComponentsConfiguration - YCbCr
    ExposureBiasValue - 0.00
    MeteringMode - Spot
    Flash - Flash fired, Compulsory flash mode
    FocalLength - 30.63 mm
    FlashPixVersion - 0100
    ColorSpace - sRGB
    ExifImageWidth - 4672
    ExifImageHeight - 3104
    InteroperabilityOffset - 54456
    SensingMethod - One-chip color area sensor
    FileSource - Other
    SceneType - Other
    CustomRendered - Normal process
    ExposureMode - Auto
    White Balance - Auto
    FocalLengthIn35mmFilm - 46 mm
    SceneCaptureType - Standard
    Contrast - Normal
    Saturation - Normal
    Sharpness - Normal
    SubjectDistanceRange - Distant view

    Maker Note (Vendor): -
    Mode - Auto
    Quality - 5
    ISO - 800
    White Balance - Auto
    Lens Type -

    Thumbnail: -
    Compression - 6 (JPG)
    XResolution - 300
    YResolution - 300
    ResolutionUnit - Inch
    JpegIFOffset - 54580
    JpegIFByteCount - 7250


    Look at the color of table and chairhttp://tinypic.com/r/16gy52g/7
    Filename - IMGP5458.JPG
    Make - PENTAX
    Model - PENTAX K-7
    Orientation - Top left
    XResolution - 300
    YResolution - 300
    ResolutionUnit - Inch
    Software - K-7 Ver 1.10
    DateTime - 2011:02:06 14:34:40
    Artist - Edison
    YCbCrPositioning - Co-Sited
    Copyright -
    ExifOffset - 694
    ExposureTime - 1/80 seconds
    FNumber - 9.00
    ExposureProgram - Aperture priority
    ISOSpeedRatings - 800
    ExifVersion - 0221
    DateTimeOriginal - 2011:02:06 14:34:40
    DateTimeDigitized - 2011:02:06 14:34:40
    ComponentsConfiguration - YCbCr
    ExposureBiasValue - 0.00
    MeteringMode - Spot
    Flash - Flash fired, Compulsory flash mode
    FocalLength - 35.00 mm
    FlashPixVersion - 0100
    ColorSpace - sRGB
    ExifImageWidth - 4672
    ExifImageHeight - 3104
    InteroperabilityOffset - 54456
    SensingMethod - One-chip color area sensor
    FileSource - Other
    SceneType - Other
    CustomRendered - Normal process
    ExposureMode - Auto
    White Balance - Auto
    FocalLengthIn35mmFilm - 52 mm
    SceneCaptureType - Standard
    Contrast - Normal
    Saturation - Normal
    Sharpness - Normal
    SubjectDistanceRange - Distant view

    Maker Note (Vendor): -
    Mode - Auto
    Quality - 5
    ISO - 800
    White Balance - Auto
    Lens Type -

    Thumbnail: -
    Compression - 6 (JPG)
    XResolution - 300
    YResolution - 300
    ResolutionUnit - Inch
    JpegIFOffset - 54580
    JpegIFByteCount - 8175
    Last edited by noside; 19th February 2011 at 01:04 AM.

  2. #2

    Default Re: Enquiry (K7 photo)

    Maybe u had bump up the iso too high like 1600 and above.it will introduce some noise to your picture.

    your picture just looks underexpo (without flash photo)

    (flash and children photo) looks like the white balance is off

    maybe u post the exif data for further analsyis
    ....

  3. #3

    Default Re: Enquiry (K7 photo)

    Quote Originally Posted by poseur View Post
    Maybe u had bump up the iso too high like 1600 and above.it will introduce some noise to your picture.

    your picture just looks underexpo (without flash photo)

    (flash and children photo) looks like the white balance is off


    maybe u post the exif data for further analsyis
    ISO only 800

    updated in first post thanks

  4. #4
    Member
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    Location
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    Posts
    1,984

    Default Re: Enquiry (K7 photo)

    The main problem here seems to be underexposure. Pic 1 no need to say, in pic 2 the light fall-off from the flash is obvious, and pic 3 is generally underexposed. Noise tends to be most prominent in dark or shadow areas of a photo, and underexposure makes it worse. ISO800 should produce pretty acceptable pics on the K-7, but that may not be so if you don't get the right exposure.

    Then again, everybody has a different level of tolerance to noise, and it always helps to shoot in raw and use noise reduction software if you're bothered by it.
    My photos - see just some or all of it =)

  5. #5

    Default Re: Enquiry (K7 photo)

    All pictures are too much underexposed. K7 can produce good results at iso800 if the photo is exposed properly. Try to add some EV and use average metering instead of spot metering when shooting group photos like these. When shooting indoor photos like these, since the light condition doesn't change, you also can try to use manual mode and adjust aperture/speed yourself instead of letting the camera do everything for you.

  6. #6

    Default Re: Enquiry (K7 photo)

    I guess we all agreed picture is underexpose, so it could be a techiqune problem.

    while i was looking at your exif. iIwas wondering whats could have cause the underexpose problem. i suspect it could be the spot metering you using.

    The first picture because flash is not on. so it is underexpose.

    2 and 3rd picture flash is on. but flash "power" seems not enough. perhaps you had meter at the slightly brighter spot causing the pttl to go off.

    perhaps you try using center weighted or full metering?
    ....

  7. #7

    Default Re: Enquiry (K7 photo)

    It seems that you were taking a picture at ISO 800, f4.5 1/50s.

    Are you using the kit lens? It could be that your scene was simply too dark, and that the camera is unable to get the correct exposure due to the limitations it is facing.

    ISO - fixed at 800
    f4.5 - Already at max aperture due to kit lens.
    1/50s - At slowest "safe" shutter speed as decided by the camera.

  8. #8

    Smile Re: Enquiry (K7 photo)

    Quote Originally Posted by fengwei View Post
    All pictures are too much underexposed. K7 can produce good results at iso800 if the photo is exposed properly. Try to add some EV and use average metering instead of spot metering when shooting group photos like these. When shooting indoor photos like these, since the light condition doesn't change, you also can try to use manual mode and adjust aperture/speed yourself instead of letting the camera do everything for you.
    Hi, if same sceney happen again. what would your suggestion to remedy this situation or what setting to apply if use manual mode.

    thanks.

  9. #9

    Default Re: Enquiry (K7 photo)

    Thks for all the comments, i go and try tonight..

  10. #10

    Default Re: Enquiry (K7 photo)

    Quote Originally Posted by samkck View Post
    Hi, if same sceney happen again. what would your suggestion to remedy this situation or what setting to apply if use manual mode.

    thanks.
    It doesn't really matter what kind of scenario you are facing, or metering mode you are using, just make sure you get the exposure right. Any shooting mode would be able to get proper exposure, it all depends on the scene and your own preference. Manual mode is sometimes easier when the light condition doesn't change much (indoor or even outdoor street photos). There isn't much settings you need to do when you use manual mode, all you need to do is to set the aperture/speed combo as you wish to get proper exposure and DOF.
    Last edited by fengwei; 19th February 2011 at 04:26 PM.

  11. #11

    Default Re: Enquiry (K7 photo)

    Quote Originally Posted by samkck View Post
    Hi, if same sceney happen again. what would your suggestion to remedy this situation or what setting to apply if use manual mode.

    thanks.
    I'd suggest you turn on the histogram and learn how to read it (just do a web search on it).
    It will let you know how much to adjust your exposure upon review of your first photo.
    When lighting conditions don't change much, you can use Manual exposure and keep the settings as you have adjusted accordingly. If it changes somewhat, just use any of the auto exposure modes and keep in the compensation. Reviewing your shots every now and then and adjusting will help.

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