Can't get really sharp images on EOS 40D

Discussion in 'Photography Beginners' Forum' started by MDesigner, Jun 11, 2008.

  1. MDesigner

    MDesigner TPF Noob!

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    I have the highly touted Tamron SP 17-50mm f/2.8 lens with an EOS 40D. I was taking some shots and when I zoom in 1:1 at the part of the photo where the camera was focused, I expect it to be pretty sharp.. but it's a bit fuzzy to be honest. I tried different f-stops.. 2.8, 8, 10, tried ISO 200, ISO 400. What else would contribute to this? Am I just expecting too much, maybe? I'll see if I can post photos later.
     
  2. BoblyBill

    BoblyBill TPF Noob!

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    I don't think it's the camera that would give you soft images but possibly the lens. I would like to see some of these pics if you could please. what shudder speed you shooting at?
     
  3. icassell

    icassell TPF Noob!

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    I have the Tamron 17-50mm with my 30D and haven't had soft issues once I learned about AI and AI servo. I had been a manual-focus 35mm person for years, so the whole AF thing was new to me. I still don't trust it entirely and frequently will manual focus (have been thinking of buying a Katzeye split-screen viewing screen). I don't think you're having a camera problem -- I think you're getting into situations where the AF just isn't doing it for you.

    Another thought -- what shutter speed are you using? Are you sure it isn't camera shake?

    I love the lens -- it has become my standard walkabout glass.
     
  4. MDesigner

    MDesigner TPF Noob!

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    Any shutter speed mostly. 1/60, 1/800. I'll see if I can take some more shots later and post 1:1 cropped sections to illustrate this.
     
  5. sultan

    sultan TPF Noob!

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    How fuzzy? If a sharp edge is about 5 or less pixels wide, that's normal. Just turn up the sharpening and the 5 pixel edge becomes a 2 pixel edge.

    If it's a great blur, check the focus and if that's not the problem, you have a defective lens. Return it.

    The shutter speed sounds fine, it's not camera shake.
     
  6. julie32

    julie32 TPF Noob!

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    Are you using a tripod?? Can you post some of your images?
     
  7. Mav

    Mav TPF Noob!

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    Yeah post some photo samples. A good number of these third party lenses appear to have front or back-focusing issues, which could cause softness issues as well so keep that in mind.
     
  8. RyanLilly

    RyanLilly No longer a newbie, moving up!

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    But also, a picture will not really look "sharp" at 100% on a computer screen.
     
  9. MDesigner

    MDesigner TPF Noob!

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    Well, I was zooming in to 1:1 on my 40D's LCD display, which I was just told is not a good idea. ;) On the computer, it looks better at 1:1 for sure. But then again, I was looking at night shots (shot on a tripod, ISO 800), so that's not a great test either.

    I think I'm obsessing. I expected 1:1 to be razor sharp, that's all. Not on this Tamron.. but maybe on my future lens.. Canon 50mm f/1.4!
     
  10. passerby

    passerby TPF Noob!

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    Good idea if you have go to the store you purchased from and try it with different cameras. Hopefully you have a reciept for that lens and still under warranty.
     
  11. Mav

    Mav TPF Noob!

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    Err, okay, well I think you just answered your own question. ISO 800 shots aren't going to look sharp at 100% because they'll have either more noise, or more noise reduction, both of which muddy up images. And there's no reason to be at ISO 800 on a tripod at night either. What you want to do is shoot a long exposure at base ISO and use the camera's self timer or a remote release to minimize any vibration in your setup. So I doubt there's anything wrong with your camera or lens. You'd need to post a sample along with the EXIF data (shot data, shutter speed, aperture, iso, etc) for anybody here to know for sure. You may be obsessing, but it's probably technique related too.
     
  12. BoblyBill

    BoblyBill TPF Noob!

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    I have a 40D as well and one of my complaints is that the LCD DOES NOT do a good job of seeing sharpness... I have learned what to look for on the LCD that will give me a sharp shot at 100% and then I'm satisfied after that.

    Here's an example of what I'm talking about:

    Here's the file.

    [​IMG]

    Here's what the 40D would give you on the LCD if you zoomed in all the way on the eyes (approx.)

    [​IMG]

    Here's what the image file actually is at 100% (minus a little sharpness due to upload to flickr).

    [​IMG]

    note: I shot this with a 17-40m L, but it does give you an idea of what to look for in the "sharpness" of the LCD.
     

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