Sigma 100-300 f4 Test.

Discussion in 'Photography Forums' started by Chubster, Jan 6, 2012.

  1. Chubster

    Chubster
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    Ok, have to admit I havent had much of a chance to actually use this lens and when I have light hasnt been optimal but Im not sure if I have a slightly soft one. (lens that is :) )

    This shot was taken at 300mm f4, what do you think?

    [​IMG]
    Sigma test by ob1chubster, on Flickr

    It looks ok as is, but if I zoom to 100% it looks a lot softer than I would expect

    See here

    This was taken on a tripod using the cameras self timer so it should be as sharp as I can get it (without mirror lockup)

    Opinions really appreciated
     
  2. godsakes

    godsakes
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    try micro adjust if you have the option but otherwise I'd say you have a bad copy - I've had a copy of that lens in the past and it was much better
     
  3. twist

    twist
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    Hmm why is it soft...... F4 @ 1/8 300mm ISO 100 on a cloudy day.

    Set it at F4 ISO 200 set shutter at equiv to focal length on a tripod. Then try again. If it still is the same then it needs microadjust or a Sigma AF adjust.
     
    Last edited: Jan 6, 2012
  4. Chubster

    Chubster
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    Hmm...I assumed that if its on a tripod shutter speed shouldnt matter, no :confused:
     
  5. BubbleDouble

    BubbleDouble
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  6. twist

    twist
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    Lenses are sometimes soft but its only due to a focus adjustment issue, they dont have rubbish glass. Its not a myth just a misunderstanding of whats up.
     
  7. eddiewood

    eddiewood
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    How about indoors with external flash, the old row of batteries test.
     
  8. eddiewood

    eddiewood
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    oh I ordered a Focus Pyramid yesterday to have a crack at AF adjustment on my A77. I looked at the DIY jobs and really couldn't be bothered with them for the sake of 10 dollars plus US postage...
     
  9. Chubster

    Chubster
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    Dont have external, could try it with on board ??
     
  10. eddiewood

    eddiewood
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    I was just thinking with external you could increase the distance, but if it needs adjustment it'll not matter what the distance is as long as it's not within the minimum focus distance of course. At least it'll be a quick and dirty check.
     
  11. Chubster

    Chubster
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    Have to admit Im a bit confused with the whole battery test thing, I can see how it works with primes but not zooms, you can only adjust for one focal length ?
     
  12. Chubster

    Chubster
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    Twist, do you know how much sigma charge for calibration for out of warranty lenses ?
     
  13. godsakes

    godsakes
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  14. eddiewood

    eddiewood
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    I was suggesting a quick test with batteries, not AF adjustment. :smashin:
     
  15. Chubster

    Chubster
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  16. Chubster

    Chubster
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    Ah, ok....off to raid the remotes :)
     
  17. twist

    twist
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  18. Chubster

    Chubster
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    OK, done a quick and dirty battery test, not sure if I did it exactly correctly but to my eyes the one at 300mm is very soft. Off to Sigma then ?

    100mm

    [​IMG]
    sigma test-2 by ob1chubster, on Flickr

    300mm

    [​IMG]
    sigma test-3 by ob1chubster, on Flickr
     
  19. twist

    twist
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    300mm does look soft but is that a crop or entire image? Try stopping down to F5.6 at 300mm. These lenses dont really perform at 300mm at MFD try get a bit further away like the first shot if possible. BTW your batteries arent correctly aligned so test isnt a good judge.
     
    Last edited: Jan 6, 2012
  20. twist

    twist
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  21. twist

    twist
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    Youre stacking the batteries next to each other instead of behind and off slightly so you wont see the DOF change.
     
  22. twist

    twist
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    Camera sensor inline with the center of the middle battery, each battery should be staggered half a battery apart horizontally and about an inch apart front to back further for smaller aperture lenses.
     
  23. Chubster

    Chubster
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    That was entire image, shot same distance as the 100mm one. Ta....Will do again
     
  24. eddiewood

    eddiewood
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    ....and did the missus think you'd just gone mad? Mine did when I started taking pictures of batteries....
     
  25. twist

    twist
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    Wait till you start taking pics of cereal boxes and washing powder boxes :blush:
     
  26. eddiewood

    eddiewood
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    We're not geeks really...
     
  27. twist

    twist
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    ..... were just misunderstood.
     
  28. Chubster

    Chubster
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  29. Chubster

    Chubster
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    Haha, she gave up on me when I first went out with the spiderpro belt adaptor and camera hanging off it :rolleyes:
     
  30. Liquid101

    Liquid101
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    There are always going to be compromises with zoom lenses. However, the first image you posted looks more like camera shake than anything.

    Does it have a tripod collar? mounting it on a tripod using the camera mount is going to amplify any tiny movement.
     

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