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  1. #1
    Join Date
    Dec 2006
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    22

    How to focus better with my Canon XTi and Tamron 28-75mm

    I'm still a new to DSLR cameras and in need of your help. What can I do to improve my manual mode shots? Whenever I take pictures of the same object the manual focus I do comes out blurrier than the auto focus on the camera. It looks sharp and clear through the view finder but once I snap the picture and review it on my LCD screen all of the pictures that was taken manually seems a bit blur. The pictures I tested tonight was used on a tripod stand. What am I doing wrong? Are there any tips or tricks I need to know when manually focusing the lens?

    Canon Rebel XTi 400d with Tamron 28-75mm F2.8 Lens.

    Picture #1 was taken with manual focus.
    Picture #2 was taken with the camera autofocus.
    Both was on "M" mode.

    1.


    2.
    Last edited by sinitry23; 01-22-2007 at 07:45 PM.

  2. #2
    Join Date
    Jul 2005
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    8,163
    Adjust the diopter to match your vision. It's that little wheel/knob next to the viewfinder.

  3. #3
    Join Date
    Dec 2004
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    Quote Originally Posted by cdi-buy.com View Post
    Adjust the diopter to match your vision. It's that little wheel/knob next to the viewfinder.
    Yeah what Don said. And you didn't ask, but the Tamron 28-75 was known to have focus issues with the XT (I had Tamron calibrate my copy twice and ultimately refund my money due to problems focusing on my XT - don't know if it's the same on an XTi or if that's part of your problem since it seems to auto focus fine.)
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  4. #4
    Join Date
    Aug 2006
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    You may also want to use f9 for these shots as all of the box and wallet should be sharp then
    Canon 350D l EF-S 10-22 l EF-S 17-55 l EF 50 f/1.8 l EF 70-200 2.8 IS l 430EX l

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  5. #5
    Join Date
    Dec 2006
    Posts
    22
    Quote Originally Posted by 24Peter View Post
    Yeah what Don said. And you didn't ask, but the Tamron 28-75 was known to have focus issues with the XT (I had Tamron calibrate my copy twice and ultimately refund my money due to problems focusing on my XT - don't know if it's the same on an XTi or if that's part of your problem since it seems to auto focus fine.)
    How can I test my lens out to see if there is that same focus problem or not? Was the focus problem from maunal focus or auto focus? Do you send the lens back to the manufacture for the calibration? Thanks

  6. #6
    Join Date
    Jul 2004
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    Manually focusing through the tiny little peephole of a viewfinder on the XTi is tricky business . Unless the AF can't lock on because of the low contrast of the scene, I can't see any reason to manually focus. I never do (with AF lenses, at least). The XTi has the AF pattern of the 20D/30D, so you should have an AF point where you need it no matter what the scene.

    ETA - there can't be a focus problem with manually focusing - just a user problem! It's the AF system that can get out of calibration. Since yours seems to AF fine, I think your lens is perfect. Your eyes, OTOH...
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  7. #7
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    Jul 2004
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    Formerly South Wales. Now South Carolina.
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    I don't get problems using my 28-75 on my XT.

  8. #8
    Join Date
    Jun 2005
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    I think I kow what Sinitry is talking about and have often wondered the same thing (re Manual Focus).

    So, in relation to responses already given to Sinitry, I'll further question the issue.

    (Sinitry....this is not meant as a hijack of your thread, so I hope we both get the answer we are after )

    Like Sinitry, when using the AF, I find the resulting photos are usually focused correctly and looked focused through the View Finder at the time of shutter release.....therefore, any question of adjusting the dioptor would be a moot point (and the same would apply to aperture settings if these were not altered between AF and MF)

    So based on this, if that same user selects MF, and the scene looks focused through the View Finder.....why wouldn't the resulting shot be in focus ?
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