Sample images for focus problems

hesaiashesaias Registered Users Posts: 186 Major grins
edited August 10, 2007 in Cameras
Here is the EF 50mm

181915576-O.jpg

The 28-135mm IS

181915803-O.jpg

And sadly, my 70-200 f2.8 L

181916031-O.jpg

At this point, I have no idea what to do. I have always been disappointed with my 70-200, but I figured it was me. After a year of use, it still yeilds the same irratic results. So I suspected the Body. Looks like its the lens.

What do you guys think, and what can I do?
Scott

Canon Rebel XT
Canon 580 EX Speedlight
Canon EF 50mm f1.8
Canon EF IS 28-135mm f/3.2-5.6
Canon EFL 70-200 f/2.8
SanDisk Ultra IIs

Comments

  • aj986saj986s Registered Users Posts: 1,100 Major grins
    edited August 9, 2007
    Are you shooting with UV filter attached? Is so, try without it. Maybe the filter has distortion.

    Also, does the lens have IS? If so, try sampling with IS on and off.

    Is the lens seating properly/completely on the camera body?

    Not what I would expect from an L series lens......good luck!
    Tony P.
    Canon 50D, 30D and Digital Rebel (plus some old friends - FTB and AE1)
    Long-time amateur.....wishing for more time to play
    Autocross and Track junkie
    tonyp.smugmug.com
  • ZanottiZanotti Registered Users Posts: 1,411 Major grins
    edited August 9, 2007
    OK, perhaps a dumb idea, but are you also far enough away that the lens can focus. Mine can only begin to focus at about 24" or so......

    Do you have that little switch on 3m or 1.2m?

    Z
    It is the purpose of life that each of us strives to become actually what he is potentially. We should be obsessed with stretching towards that goal through the world we inhabit.
  • hesaiashesaias Registered Users Posts: 186 Major grins
    edited August 9, 2007
    aj986s wrote:
    Are you shooting with UV filter attached? Is so, try without it. Maybe the filter has distortion.

    Also, does the lens have IS? If so, try sampling with IS on and off.

    Is the lens seating properly/completely on the camera body?

    Not what I would expect from an L series lens......good luck!

    Yep, UV filter is on. I will reshoot with the L and post the results
    Scott

    Canon Rebel XT
    Canon 580 EX Speedlight
    Canon EF 50mm f1.8
    Canon EF IS 28-135mm f/3.2-5.6
    Canon EFL 70-200 f/2.8
    SanDisk Ultra IIs
  • claudermilkclaudermilk Registered Users Posts: 2,756 Major grins
    edited August 10, 2007
    Zanotti wrote:
    OK, perhaps a dumb idea, but are you also far enough away that the lens can focus. Mine can only begin to focus at about 24" or so......

    Do you have that little switch on 3m or 1.2m?

    Z

    That was my first thought. My second thought is ok, with this test it appears to be back-focusing 2mm. Does that make any visible difference in real-world shooting? This is where IMHO doing these kinds of test can make you unhappy with a perfectly good lens--I would give even odds Canon will say it's within spec.
    Chris
    http://www.chrislaudermilkphoto.com/
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