A&P Focusing the Canon 50mm f/1.4 (part I) **pics**

Discussion in 'Lifestyle' started by JaimeZX, Jan 6, 2007.

  1. JaimeZX

    JaimeZX Formerly of :Sep 2001: fame - Also: Sprout Crew OT Supporter

    Joined:
    Nov 7, 2005
    Messages:
    9,226
    Likes Received:
    26
    Location:
    Charleston, SC
    On Christmas I was shooting a very nice sunrise, but for some reason looking in-camera at the results, none of the trees in the distance looked very sharp. Of course this may be more a function of the LCD than the lens. However, I found if I manually set the focus to infinity, the trees were much MORE OoF than if I let the autofocus handle it. I just think it's weird than manual at infinity = OoF distant objects.

    Thoughts on that?

    Here are some samples with 100% crops. Am I just expecting too much from this lens?

    ISO-1600; f/6.3, 1/13s.
    [​IMG]

    [​IMG]



    ISO-100; f/8, 1/50s.
    [​IMG]

    [​IMG]



    ISO-100, f/7.1, 1/60s.
    [​IMG]

    [​IMG]

    Also, any comments you may have on the pictures are welcome. :)
     
    Last edited: Jan 6, 2007
  2. Tedrzz

    Tedrzz New Member

    Joined:
    Jul 6, 2005
    Messages:
    1,578
    Likes Received:
    0
    Location:
    Brooklyn, NY
    are you shooting wide open? any lens at its maximum aperature won't produce stunning results
     
  3. JaimeZX

    JaimeZX Formerly of :Sep 2001: fame - Also: Sprout Crew OT Supporter

    Joined:
    Nov 7, 2005
    Messages:
    9,226
    Likes Received:
    26
    Location:
    Charleston, SC
    First one is f/6.3.
    Second one is f/8.
    Third one is f/7.1.

    Compare to this shot of my great uncle at f/1.4, ISO-400, 1/4000s:

    100% Crop:
    [​IMG]

    Full pic:
    [​IMG]

    I think the 100% crop is much sharper here.

    Also, how would you crop this image (if at all) to improve it? I like the ice sculpture and the bg bokeh. :wiggle:
     
  4. eof

    eof New Member

    Joined:
    Jan 17, 2002
    Messages:
    7,288
    Likes Received:
    0
    your uncle looks like a turkey
     
  5. mattsb2000

    mattsb2000 OT Supporter

    Joined:
    Jun 15, 2003
    Messages:
    61,666
    Likes Received:
    1
    Location:
    San Bernardino, CA
    My 70-200f/4 looks fine wide open.
     
  6. mojito

    mojito New Member

    Joined:
    Mar 8, 2003
    Messages:
    62,877
    Likes Received:
    0
    shutter speeds on the shots?
     
  7. JaimeZX

    JaimeZX Formerly of :Sep 2001: fame - Also: Sprout Crew OT Supporter

    Joined:
    Nov 7, 2005
    Messages:
    9,226
    Likes Received:
    26
    Location:
    Charleston, SC
    Good call. I'll edit the first post with all the shot data.
    I guess the speeds are a tad slow; no tripod but for the second and third shots I was resting the camera on the railing you can see in the first shot. I s'pose it could be motion blur, huh? :o
     
  8. mobbarley

    mobbarley Active Member

    Joined:
    Mar 4, 2005
    Messages:
    9,256
    Likes Received:
    2
    Location:
    Sydney
    a) hold the camera level

    b) use a tripod and ~F8

    c) be careful you are not focusing past infinitiy (if the 50/1.4 has IR guides)

    d) how fast was the shutter in this shot?


    Tried another lens? if they all do the same:
    - swab clean your sensor
    - get your af adjusted (or do it yourself)
     
  9. JaimeZX

    JaimeZX Formerly of :Sep 2001: fame - Also: Sprout Crew OT Supporter

    Joined:
    Nov 7, 2005
    Messages:
    9,226
    Likes Received:
    26
    Location:
    Charleston, SC
    a) I don't have any pelf horizons here. :o

    b) Tripod definately would've been helpful but (1) I didn't have one with me and (2) I was surprised by the sunrise and didn't really have time to run and look for one. The railing was the best I could do.

    c) Really? INTERESTING. How does that work? That could explain the problem I had with manually going to what I thought was infinity.

    d) See above.

    e) Didn't have time to get the kit lens, although I was wishing I had the 18mm for this landscape. :o How do you adjust the AF? Is it something that can correct front-focus? I think this lens is front-focusing a tad but I have to set up a test rig to see if it is actually doing this or if it's user error. :o
     
  10. mattsb2000

    mattsb2000 OT Supporter

    Joined:
    Jun 15, 2003
    Messages:
    61,666
    Likes Received:
    1
    Location:
    San Bernardino, CA

    nga what??
     
  11. mobbarley

    mobbarley Active Member

    Joined:
    Mar 4, 2005
    Messages:
    9,256
    Likes Received:
    2
    Location:
    Sydney
    so are you blind or am I?

    1/13th is not fast enough if you want the sharpest results.

    it can be (over) simplified as 1/(focal length) for hand holding. so in this case 1/50.. but you should expererment and find your own groove.

    for focusing at inf, dont turn the ring till it stops. Most lenses will focus past infinity for either temp/manufacturing differences or to allow focusing for light out of the visible spectrum (ir film i believe :dunno:)

    Look at this picture:

    [​IMG]

    You line the vertical line up with the other verticle line, not as far as it will turn.

    The red dot is for IR focus, the |22 ----- 22| is a DOF scale @ F22, not very useful. Old lenses used to have more.
     
    Last edited: Jan 6, 2007
  12. mobbarley

    mobbarley Active Member

    Joined:
    Mar 4, 2005
    Messages:
    9,256
    Likes Received:
    2
    Location:
    Sydney
    behind the lens mount there is an adjustment which will adjust the AF, you obviously only want to do this if all of your lenses are similarly misfocusing, otherwise the individual lens needs to be adjusted -not the camera.
     
  13. JaimeZX

    JaimeZX Formerly of :Sep 2001: fame - Also: Sprout Crew OT Supporter

    Joined:
    Nov 7, 2005
    Messages:
    9,226
    Likes Received:
    26
    Location:
    Charleston, SC
    You're probably thrown off by the shoreline which is closer in the center and recedes as you go right. In the middle picture there is also an island at far left. The horizons are true, trust me. :)


    Yes, I agree. I would almost never handhold below 1/50th, but as I said I was resting the camera (or my elbows) on the railing in the bottom two shots which gave me more confidence. However some of this could still be motion blur, I would be inclined to agree.


    Yes I see. But how would AF know? I wonder if I throw my 58mm R72 on there if the AF will correctly focus at infinity? :eek:
    My Sony always has problems with AF when shooting IR. :sad2:

    I see I see. That makes sense. Would've been nice to notice this before, but it was the day after getting the lens and these were early shots.

    Question: how do you line up a vertical line with a verticle line? :p

    Thanks again, guys, I appreciate your thoughts. :)
     
  14. mattsb2000

    mattsb2000 OT Supporter

    Joined:
    Jun 15, 2003
    Messages:
    61,666
    Likes Received:
    1
    Location:
    San Bernardino, CA
    Interesting.

    Can you point an arrow at it?

    [​IMG]

    [​IMG]
     
  15. mobbarley

    mobbarley Active Member

    Joined:
    Mar 4, 2005
    Messages:
    9,256
    Likes Received:
    2
    Location:
    Sydney
    Probably not, try it and see. Also if you shoot with a smaller aperture it wont be so critical, the inf point will be close enough (or see if the red line works with your R72)

    eat my balls.
    :o
     
  16. mobbarley

    mobbarley Active Member

    Joined:
    Mar 4, 2005
    Messages:
    9,256
    Likes Received:
    2
    Location:
    Sydney
    On my 350 its somewhere here..

    [​IMG]


    You need a small allen key
     
  17. mattsb2000

    mattsb2000 OT Supporter

    Joined:
    Jun 15, 2003
    Messages:
    61,666
    Likes Received:
    1
    Location:
    San Bernardino, CA

    :cool:

    Scary but :cool:

    Do you have the canon tools program? I've seen screens of it, and it looks dangerous. :noes:
     
  18. mobbarley

    mobbarley Active Member

    Joined:
    Mar 4, 2005
    Messages:
    9,256
    Likes Received:
    2
    Location:
    Sydney
    no, never head of it. but i'll take a copy :naughty:
     
  19. mattsb2000

    mattsb2000 OT Supporter

    Joined:
    Jun 15, 2003
    Messages:
    61,666
    Likes Received:
    1
    Location:
    San Bernardino, CA

    :werd:

    Anyone have it? :x:
     
  20. JaimeZX

    JaimeZX Formerly of :Sep 2001: fame - Also: Sprout Crew OT Supporter

    Joined:
    Nov 7, 2005
    Messages:
    9,226
    Likes Received:
    26
    Location:
    Charleston, SC
    Working on another post I'll put up later. Looks like the lens is back-focusing by ¼"-½". I will provide evidence later this evening when I get home. (At a friend's right now.) :hs:
     

  21. Limewire Newsgroups....
     
  22. mattsb2000

    mattsb2000 OT Supporter

    Joined:
    Jun 15, 2003
    Messages:
    61,666
    Likes Received:
    1
    Location:
    San Bernardino, CA

    Email it to me :x:
     

Share This Page