What's going on here?

Discussion in 'Photography Beginners' Forum' started by CodyRisko, Mar 7, 2012.

  1. CodyRisko

    CodyRisko TPF Noob!

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    I have had my Canon Rebel XSI for awhile now, I know how to use it in nearly all the settings, but recently my pictures haven't been as crisp in my opinion. I normally use "manual focus" but sometimes use "auto focus." Here is a picture that doesn't look crisp to me:

    Link to Picture
    Not a great picture obviously but took this to use as an example.

    To make matters worse, I took off my lens to take a look inside and somehow I managed to scratch my mirror in the process, while I know this doesn't affect pictures it's just a minor annoyance. But back to the main subject, it just hasn't been taking as crisp pictures of late. Do you guys see what I am seeing or am I just going crazy? If you have any suggestions please feel free to give them.


     
  2. 412 Burgh

    412 Burgh No longer a newbie, moving up!

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    What exact camera and lens? also post Exif data for further help.
     
  3. CodyRisko

    CodyRisko TPF Noob!

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    Using Canon Rebel XSI, and the standard lens that come with it.


    File name: G:\DCIM\202CANON\IMG_1775.JPG
    File type: JPEG
    File size: 3,104.6 KB
    Creation date: 3/7/2012 14:46
    Last modification: 3/7/2012 14:46
    Make: Canon (Canon Global)
    Camera: Canon EOS DIGITAL REBEL XSi
    Lens: Canon EF-S 18-55mm F3.5-5.6 IS
    Software: Firmware Version 1.0.4
    Dimension: 4272 x 2848 px (12.2 MP, 3:2)
    Focal length: 25 mm (equiv. 41 mm)
    Aperture: F10
    Exposure time: 1/200"
    ISO speed rating: 100/21°
    Program: Program AE (Manual)
    Metering Mode: Evaluative
    White Balance: Daylight
    Focus Mode: Off (Manual Focus)
    Noise Reduction: Off
    Flash: Flash did not fire, compulsory flash mode
     
  4. analog.universe

    analog.universe TPF Noob!

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    Did you shoot this as a JPG or RAW?

    If JPG, there's a sharpness adjustment in the picture styles that may've gotten turned down...

    The image you linked to does look soft, but not _that_ soft. With that particular lens, it's plausible that an unsharpened photo will look this way.
     
  5. KmH

    KmH In memoriam Supporting Member

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    Are you familiar with how your camera works?

    That mirror you scratched is actually only 50% reflective. 50% of the light from the lens gets deflected up to the viewfinder. The 50% of the light that goes on through the mirror gets deflected by a smaller secondary mirror down to the Phase-Detection auto focus module that sits in the bottom of the camera. There is a clear window over the AF module. The image from the lens is split in 2 and the phase of the 2 images is compared to auto focus the camera.

    Over time the secondary mirror and the window get dusty/dirty and the AF module doesn't work so good any more.
     
  6. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    You have a 12.2mp camera, and post a 6.8mp image. Perhaps you're not shooting at in the Large setting.

    It also looks like the jpeg compression leaves a lot to be desired. It is set to the lowest (smallest file size) setting?
     
  7. CodyRisko

    CodyRisko TPF Noob!

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    What would you suggest doing then, sorry I am semi-new to DSLR's and this is the first time I scratched the mirror (obviously.)


    Where are you seeing that the picture I took is only 6.8 mp?
     
  8. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    The one in your link is only 3204 by 2136. 3204 x 2136 = 6,843,744 = ~ 6.8mp.
     
  9. CodyRisko

    CodyRisko TPF Noob!

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    Oh no, the original picture is 4272 x 2848, the site I uploaded it to must have resized it.
     
  10. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    That's still only 9.1 mp.
     
  11. CodyRisko

    CodyRisko TPF Noob!

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    How would I get it to 12.2 in that case?
     
  12. One2

    One2 TPF Noob!

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    Not adding anything productive to this thread but I get 12.2 mp? 4272 X 2848 = 12,166,656.
     

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