Lens vs lens vs lens

Discussion in 'Photography Beginners' Forum' started by wgp1987, May 23, 2009.

  1. wgp1987

    wgp1987 TPF Noob!

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    Hey guys. It is the most annoying thread "poster" you know. I have a sigma 28-70 f2.8-4 lens. When i take photos with this lens, the results ... are never satisfying. I REALLY want a Canon 17-85 USM IS lens or the Tamron 17-50mm f2.8. I was thinking that the canon might be the better bet. Only reason i am thinking this is because whenever i use a lens with a wide aperature the focus sometimes is too soft or if i wish not to create a shallow DOF and keep the shutter open longer, the results are blurry. (if im saying this correctly) Possibly the IS in the Canon will help when taking photos in lower light more than a wider aperature? I wish not to use a tripod, and the hardest thing is to keep the camera still. I realize the Tamron might be better glass, but what about when i want more in focus and a less shallow DOF? I have a 50mm 1.8 .... maybe the Canon 17-85 is the way to go? What do you think? ... p.s. I dont like to use flash or raise ISO too high.
     
  2. KmH

    KmH Helping photographers learn to fish Supporting Member

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    Ever notice that most pro's use a tripod or camera stand and lights, even outside?
     
    Last edited: May 23, 2009
  3. Josh66

    Josh66 Been spending a lot of time on here!

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    It will help to eliminate camera shake, but it will do nothing at all for a moving subject. It will stop the camera from moving (so to speak) - but that's it.
     
  4. farmerj

    farmerj TPF Noob!

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    I have also noticed that not only are they using a tripod,....

    Most are also using MF or LF cameras.
     
  5. wgp1987

    wgp1987 TPF Noob!

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    Its not a realization. To me it is undesired. Catching moving subjects is of course important. but i do have a 50mm1.8 that can get the job done in the close rance. When I scrape enough pennies together ill buy the tamron 70-200 f2.8 .... or the canon 70-200 f4L (sacrifice noise for quality, better choice?) BUT that is a differant thread, when the time comes. At that focal length, "17-85" it will most likely be used indoors for handheld still shots. Would you guys say the canon is the better choice for that?
     
  6. wgp1987

    wgp1987 TPF Noob!

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    Mainly i was hoping someone knew the differance in the amount of "stops" better the IS would be over the faster aperature. If I put that correctly.
     
  7. farmerj

    farmerj TPF Noob!

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    I would not say the Canon 17-85 is better than the Nikon 16-85. Comparing pictures, it's almost impossible to tell the difference between the two.

    As to IS/VR and how many stops? Some say two, some say three.

    Experience has shown me two stops. Now, do you pick those two stops up with IS/VR technology? or do you pick it up with glass speed, f/2.8 vs f/4 or f/5.6?

    I am fast coming to the conclusion, IS/VR is a marketing gimmick because people could not afford fast professional grade glass.
     
  8. wgp1987

    wgp1987 TPF Noob!

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    I have been trying to find someone willing to trade their canon 18-50is lens for my sigma 28-70 f2.8-70 .... then i would buy the tamron 17-50
     
  9. wgp1987

    wgp1987 TPF Noob!

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    Well thats no enitrely true. Lets say you and I are out on a shoot and we both go to take a photo of a random object. We both have the same camera body, but i have a 17-85 is lens and you have the tamron 17-50 f2.8. Now both of our cameras are set to AV (aperature priority) and have it set to the widest possible aperature. I would be at 4, and you would be at 2.8 (at 18mm, with same ISO). You would acheive a more shallow DOF and i would have more in focus. Im saying this as if there was enough light that the f2.8 wouldnt be blurry, like in the shade of a tree (im just saying) .... Now if you wished to achieve a less shallow DOF you would have to raise your aperature. Then the IS would have the advantage, correct? :hug::
     
    Last edited: May 23, 2009
  10. farmerj

    farmerj TPF Noob!

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    just how much of a change in DOF is there in 2/3 stop?


    And would that be better served by changing from 17-50mm or 23-85 MM (Class) or even 70-200mm?:eyebrows:
     
  11. wgp1987

    wgp1987 TPF Noob!

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    I apoligize because im not that advanced to know, thats why i am asking.

    I had to correct the the Canon 17-85's min av is f4 .. lame right?

    haha ....... I really should just hold out to get the Canon 17-55mm f2.8 Is USM for $1000 ........ I am going to jamaica in july, and want a great lens to bring with me .... maybe i should get the 28-135 IS USM Macro?
     
  12. farmerj

    farmerj TPF Noob!

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    Not an issue. Partly why I ask the question. I have a decent idea when I want to use different apertures. But to tell the difference between 1/3, 2/3 and a full stop, I am still working on that.

    I still have days I sit down and take picture of something and only change the aperture to see the changes in DOF.
     

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