Results 1 to 13 of 13

Thread: Anyone experience unsharp pictures once in a while?

  1. #1

    Default Anyone experience unsharp pictures once in a while?

    Hi would like to ask if this is common? some times i get not so sharp pictures even i use low ISO of 200-640 with shutter relatively fast for a 35mm f1.8 prime in broad day (~1/80-1/500), aperture f1.8-f3.2, i know the acceptable shutter for handshake is 1/focal length for full frames?not so sure with cropped sensors though..the occurence is around 1 or 2 in 30 shots..wonder if this has happen to you guys also?

  2. #2

    Default Re: Anyone experience unsharp pictures once in a while?

    my guess is that you don't have a very good copy of the body. bring it down to the service center
    I refuse to List my camer@ equipment here.

  3. #3
    Senior Member
    Join Date
    Apr 2008
    Location
    Singapore, east-ish
    Posts
    2,291

    Default Re: Anyone experience unsharp pictures once in a while?

    Quote Originally Posted by ParapitikMata View Post
    Hi would like to ask if this is common? some times i get not so sharp pictures even i use low ISO of 200-640 with shutter relatively fast for a 35mm f1.8 prime in broad day (~1/80-1/500), aperture f1.8-f3.2, i know the acceptable shutter for handshake is 1/focal length for full frames?not so sure with cropped sensors though..the occurence is around 1 or 2 in 30 shots..wonder if this has happen to you guys also?
    I suspect that either you didn't focus on the subject.At f/1.8-f/3.2, you don't have much depth of field
    Last edited by Daedalus Trent; 20th November 2009 at 03:59 PM.

  4. #4

    Default Re: Anyone experience unsharp pictures once in a while?

    Yes i agree. Most likely you moved after you focus.

  5. #5

    Default Re: Anyone experience unsharp pictures once in a while?

    Quote Originally Posted by ParapitikMata View Post
    Hi would like to ask if this is common? some times i get not so sharp pictures even i use low ISO of 200-640 with shutter relatively fast for a 35mm f1.8 prime in broad day (~1/80-1/500), aperture f1.8-f3.2, i know the acceptable shutter for handshake is 1/focal length for full frames?not so sure with cropped sensors though..the occurence is around 1 or 2 in 30 shots..wonder if this has happen to you guys also?
    The main clue to your dilemma is the large aperture. This results in a thin DOF, thus any slight shift in the distance between yourself and the subject will be amplified as the focal plane is so thin. Quite a common issue in the "focus and recompose" method if you are shooting at, say, f/1.8

    If you can post a sample pic, we can take a look and advise you better.
    Alpha

  6. #6
    Senior Member
    Join Date
    Jun 2006
    Location
    big tree town
    Posts
    2,389

    Default Re: Anyone experience unsharp pictures once in a while?

    Quote Originally Posted by ParapitikMata View Post
    Hi would like to ask if this is common? some times i get not so sharp pictures even i use low ISO of 200-640 with shutter relatively fast for a 35mm f1.8 prime in broad day (~1/80-1/500), aperture f1.8-f3.2, i know the acceptable shutter for handshake is 1/focal length for full frames?not so sure with cropped sensors though..the occurence is around 1 or 2 in 30 shots..wonder if this has happen to you guys also?
    yah it happens, based on those settings.
    cameras are not made of tofu

  7. #7

    Default Re: Anyone experience unsharp pictures once in a while?

    Quote Originally Posted by ParapitikMata View Post
    Hi would like to ask if this is common? some times i get not so sharp pictures even i use low ISO of 200-640 with shutter relatively fast for a 35mm f1.8 prime in broad day (~1/80-1/500), aperture f1.8-f3.2, i know the acceptable shutter for handshake is 1/focal length for full frames?not so sure with cropped sensors though..the occurence is around 1 or 2 in 30 shots..wonder if this has happen to you guys also?
    er, aperture f/1.8 to f/3.2.. that is shallow dof..

    so this is not any fault of equipment really, it is fault of user more often than not.

    still got factors such as handshake.

    also, aperture f/1.8 will not be very sharp.. no lens is sharp wide open.

  8. #8

    Default Re: Anyone experience unsharp pictures once in a while?

    I would very much contribute my blur pictures to operator error, and more often than not, it is..
    Playing with M43.

  9. #9

    Default Re: Anyone experience unsharp pictures once in a while?

    make sure ur camera is not accidentally set to Al servo. i made that mistake before.. esp when ur dof is so thin...

  10. #10
    Moderator Octarine's Avatar
    Join Date
    Jan 2008
    Location
    Pasir Ris
    Posts
    12,388

    Default Re: Anyone experience unsharp pictures once in a while?

    Another reason can be that AF sensors are not locking on the subject that you have in mind. Do you use single AF point? Does your object really has contrast patterns to make the AF sensor 'snap' on it? I had a couple of occasions where the AF sensor simply got distracted, locked on something nearby. With f/8 it might not be an issue, with your wide aperture it becomes visible immediately. Bear in mind the sensor area is bigger than the marking in the viewfinder.
    EOS

  11. #11
    Deregistered shaoken's Avatar
    Join Date
    Feb 2008
    Location
    Clementi/West Coast
    Posts
    2,115

    Default Re: Anyone experience unsharp pictures once in a while?

    I encountered such problem before when I was new to DSLR but let me share my experience.
    There are 2 types of auto-focus, the continuous auto-focus and the single auto-focus.

    Continuous auto-focus: When you move your cam, it will hunt for something else to be in-focus.
    Single auto-focus: Once it is in focus, even if you move your cam, it will not "re-focus" unless you release the shutter-release button and half press again.

    Another thing note is your focusing.
    Since you're using a large aperture lens, there is possibility that something you focus on may be OOF easily.

    IF you think that the problem does not lie with the body, look out for these factors.

  12. #12

    Default Re: Anyone experience unsharp pictures once in a while?

    thanks guys, ill take into account what you've all said..

  13. #13
    Senior Member
    Join Date
    Apr 2008
    Location
    Singapore, east-ish
    Posts
    2,291

    Default Re: Anyone experience unsharp pictures once in a while?

    Quote Originally Posted by ParapitikMata View Post
    thanks guys, ill take into account what you've all said..
    No worries

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •