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Thread: manual focusing

  1. #1
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    Default manual focusing

    hi,

    - when i do manual focusing, the image look through the view finder is sharp, but image come out blur.

    - when i do auto focus, some time image through view finder blur but the image come out sharp
    AND of course also, some time image through view finder sharp, image come out also sharp.

    for some scene with very low light (that need long shutter), and the auto focus cannot work (too dark), these case i must use manual, but it seems that what is see not really wat i'll get.

    what is the problem here? did i miss something ?

  2. #2

    Default Re: manual focusing

    what camera are you using?

  3. #3

    Default Re: manual focusing

    Quote Originally Posted by htthach
    hi,

    - when i do manual focusing, the image look through the view finder is sharp, but image come out blur.

    - when i do auto focus, some time image through view finder blur but the image come out sharp
    AND of course also, some time image through view finder sharp, image come out also sharp.

    for some scene with very low light (that need long shutter), and the auto focus cannot work (too dark), these case i must use manual, but it seems that what is see not really wat i'll get.

    what is the problem here? did i miss something ?
    Didn't someone ask this question before? There's a whole list of answers in that thread.
    http://forums.clubsnap.org/showthread.php?t=180640
    Last edited by lsisaxon; 8th March 2006 at 05:28 PM.

  4. #4
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    Default Re: manual focusing

    Quote Originally Posted by lsisaxon
    Didn't someone ask this question before? There's a whole list of answers in that thread.
    http://forums.clubsnap.org/showthread.php?t=180640
    Yes there're people here having this issue before too.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

  5. #5
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    Default Re: manual focusing

    thanks
    sorry i didn't know that

    btw, i'm using canon 10D

  6. #6

    Default Re: manual focusing

    Could it be that your dioptre adjustment is out?

  7. #7
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    Default Re: manual focusing

    Ahhh...could be too...
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

  8. #8
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    Default Re: manual focusing

    this problem could also be due to your poor eyesight.
    if you dont have a 6/6 vision, you will focus based on what YOU think is sharp


    same concept goes for microscopy
    especially since it magnifies the object by so much

    i notice that whenever someone comes after me to use the microscope, they will ALWAYS readjust the sharpness.

    my 2 cents

  9. #9
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    Default Re: manual focusing

    Haizz...i don't have 6/6 vision though.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

  10. #10
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    Default Re: manual focusing

    Quote Originally Posted by Snoweagle
    Haizz...i don't have 6/6 vision though.
    oh wellz
    either
    get your eyes fixed
    use AF
    or stop down and try to MF
    =)

  11. #11
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    Default Re: manual focusing

    Quote Originally Posted by haagen_dazs
    oh wellz
    either
    get your eyes fixed
    use AF
    or stop down and try to MF
    =)
    But i still can see clearly through my viewfinder.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

  12. #12

    Default Re: manual focusing

    Quote Originally Posted by htthach
    hi,

    - when i do manual focusing, the image look through the view finder is sharp, but image come out blur.

    - when i do auto focus, some time image through view finder blur but the image come out sharp
    AND of course also, some time image through view finder sharp, image come out also sharp.

    for some scene with very low light (that need long shutter), and the auto focus cannot work (too dark), these case i must use manual, but it seems that what is see not really wat i'll get.

    what is the problem here? did i miss something ?
    What you can do is this..
    1) perform AF,
    2) adjust the diopter adjustment until the the image is sharpest.
    3) perform a MF again, see whether you are able to get it correct this time.

    If still cannot, then you do these.
    1) put a ruler on a table,
    2) set the camera on a tripod to shoot the ruler at 45 degrees,
    3) perform AF at a known marking, eg 10cm. and take a picture with aperture at max.
    4) See whether you notice if somewhere else is sharp on the viewfinder instead.
    5) perform MF and shoot. From the image check if the actual focus is in front or behind.

    For this case, you may need to send the camera for calibration.

  13. #13
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    Default Re: manual focusing

    mirror out of alignment, easy to check, send to repairer
    when sharp in VF and sharp in photo, the depth of field due to small aperture saved the day

  14. #14

    Default Re: manual focusing

    Quote Originally Posted by haagen_dazs
    this problem could also be due to your poor eyesight.
    if you dont have a 6/6 vision, you will focus based on what YOU think is sharp


    same concept goes for microscopy
    especially since it magnifies the object by so much

    i notice that whenever someone comes after me to use the microscope, they will ALWAYS readjust the sharpness.

    my 2 cents
    Microscopy is different because there is no focusing screen but a direct optical path, so the eyepeice focus is also dependent on your eye. Same with telescopes. For SLR is different, the focusing screen will prevent the light from focusing at other points, so if the diopter is wrong, you should not be able to obtain any sharp image at all.

  15. #15
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    Default Re: manual focusing

    So that's the reason why the diopter is there to adjust according to one's eyesight.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

  16. #16
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    Default Re: manual focusing

    Quote Originally Posted by lsisaxon
    What you can do is this..
    1) perform AF,
    2) adjust the diopter adjustment until the the image is sharpest.
    3) perform a MF again, see whether you are able to get it correct this time.

    If still cannot, then you do these.
    1) put a ruler on a table,
    2) set the camera on a tripod to shoot the ruler at 45 degrees,
    3) perform AF at a known marking, eg 10cm. and take a picture with aperture at max.
    4) See whether you notice if somewhere else is sharp on the viewfinder instead.
    5) perform MF and shoot. From the image check if the actual focus is in front or behind.

    For this case, you may need to send the camera for calibration.
    the diopter is set to 0
    my eyes are okie, i'm not short sighted

    oh no, must send for repair ? :-s just bought this second hand :-s
    hopefully nothing wrong with the cam, or else maybe i'll just leave it like that, make it up to the AF )

  17. #17

    Default Re: manual focusing

    Quote Originally Posted by htthach
    the diopter is set to 0
    my eyes are okie, i'm not short sighted

    oh no, must send for repair ? :-s just bought this second hand :-s
    hopefully nothing wrong with the cam, or else maybe i'll just leave it like that, make it up to the AF )
    It probably needs some calibration. The previous company I worked in bought a D70 about 2 years back and I had to calibrate the mirrors a little. Both the AF and focusing screen distances were a bit off the sensor. Since it was a semiconductor related establishment, I was able to use the microscopes to micro align the mirrors for the AF sensor and the focusing screen. Now the camera's focusing, both AF and MF, are spot on. Too bad the camera belongs to the company.

    I was also able to verify the calibration for my own D70s which I bought later the same way. But it was good enough and I didn't have to do anything.

  18. #18
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    Default Re: manual focusing

    how to do the calibration thing?
    today brought my cam to TCW. I buy a filter, and ask the guy there to check for my what happen to my cam. Try different lens also like that. The guy at first also try to adjust the diopter but also cannot. Then he also dunno how, he giv to an old man, also dunno why.
    then how? how to repair the problem?

  19. #19

    Default Re: manual focusing

    If you want to do a lot of manual focusing, you might want to invest in a split prism add on like this:

    http://www.katzeyeoptics.com/cat--Ni...cat_nikon.html

    Take care to note the effect is has on metering.

    Not cheap though

  20. #20
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    Default Re: manual focusing

    just brought to canon today
    they said something inside get out of place and they fixed it
    free of charge

    thanks you guys

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