First test with my new Sigma 28-70 2.8

Discussion in 'People Photography' started by dizzyg44, Apr 4, 2009.

  1. dizzyg44

    dizzyg44 TPF Noob!

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    Lit with a single sb800 shooting through umbrella.

    Please critique.
    [​IMG]
     
  2. Marc Kurth

    Marc Kurth TPF Noob!

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    I have ZERO people photography/studio skills, so I don't offer comments here, but.....

    I do see what looks like posterization in his hair, left cheek and neck in particular - generally caused by heavy handed processing. Was he pasted into the background, or did you try to blur it more by any chance? What caused the overall blur?

    OK, I'll shut up now.....

    Marc

    Forgot to add: Congrats on the new lens! That's always a thrill!
     
    Last edited: Apr 4, 2009
  3. dizzyg44

    dizzyg44 TPF Noob!

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    Thanks

    The overall slight blur is shooting at 2.8, handholding probably below 1/60th.

    You are right about the posterization though. I still haven't figured out how to avoid it, I was selecting the entire background with the magic wand to darken the BG, it was originally unbleached muslin.

    Yea, to celebrate the acquisition of the new lens I added a Nikon 80-200 2.8 push pull to go along with it.
     
  4. Marc Kurth

    Marc Kurth TPF Noob!

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    Why not bring the original, unaltered file here and let some of the post processing wizards show us both some tricks?

    I know that I would learn learn from it, and I assume some other folks would too.

    Marc
     
  5. SpeedTrap

    SpeedTrap TPF Noob!

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    This image seem quite soft, I would suggest stopping down a bit and see if it is still soft.
    If so return that lens!
    This is no where near as sharp as it should be.
     
  6. Sw1tchFX

    Sw1tchFX TPF Noob!

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    Yeah it's out of focus, and the posterization...did you do any shadow/highlight or fill light in post?

    Cutting out backgrounds rarely ever works well and is never usually worth the trouble to get awful results unless of course you're shooting on a green screen, then it's easy and works great.

    Instead of adding in a fake background, shoot outside, on location. There was another person on here who tried to do what you were doing and it looked awful, every time she posted people just kept essentially saying stop, these look horrible.
     
  7. dizzyg44

    dizzyg44 TPF Noob!

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    sonofa*****.......

    Just used this test chart and it is consistently showing moderate/severe back focus. I tried probably twenty different shots with different light and other angles and it was consistently off.

    Arrgh......

    Going to go test all my other lenses to see if it's the body or just the one lens
     
  8. dizzyg44

    dizzyg44 TPF Noob!

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    Crap,

    My new (to me) 80-200/2.8ED and the sigma 28-70/2.8 are badly back focusing.

    My Nikon 50/1.8 and sigma 70-300/f4-5.6 have an everso slight front focus, so minute that it could just be me and my crappy tripod.

    I can't tell with the tokina 12-24/4 as I can't get just the chart in the frame, but the entire thing is sharp.
     
  9. Sw1tchFX

    Sw1tchFX TPF Noob!

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    What camera you shoot with? can you do AF-fine tune?

    otherwise, if it's 4 lenses with problems, i'd be suspecting that it's your camera body that's having the problems, not the lenses. try another camera with the lenses, even if it means going into a camera shop and testing it out on their cameras.
     
  10. dizzyg44

    dizzyg44 TPF Noob!

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    It only noticeable on my two new lense at 2.8. The Sigma 28-70 and an old 80-200 push pull.

    it's barely noticeable (slightly forward) on my 50 at 1.8 and 70-300 at f4

    I tested the sigma again at 3.2 and it was drastically better though, at f4 I'm starting to think it's sharper than my 18-105 was at f4 at 28mm.

    I'm notn sure on the math though but looking at sigma's DOF chart for this lens it may be within their acceptable limits ......which sucks.
     
  11. Sw1tchFX

    Sw1tchFX TPF Noob!

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    ...what camera are you using?
     
  12. SrBiscuit

    SrBiscuit TPF Noob!

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    yeah im seeing a lot of weird hard lines too.

    i echo what sw1tch said about cutting people out of backgrounds...
     

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