Same lens 400d VS 40d

Discussion in 'Photography Beginners' Forum' started by jamesino, Jan 19, 2008.

  1. jamesino

    jamesino TPF Noob!

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    Assuming I mount the same lens, say the Sigma 17-70mm f/2.8-4.5, on the Canon EOS 400D and 40D, will I notice a big difference, if any, in the image quality?

    Is the image quality mainly dependent on the camera body or the lens?
     
  2. Mav

    Mav TPF Noob!

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    I'm pretty sure they both use the same exact sensor, so I think you'd be hard pressed to see any difference. Image quality depends mostly on the person standing behind the camera. ;) But yeah, the lens will make the bigger difference.
     
  3. Peanuts

    Peanuts TPF Noob!

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    I believe the 400D has a 'crop' of 1.8X and the 40D is 1.6X so it might seem a little more wide. The quality won't change due to the lens though - you might notice a little less noise however at higher ISOs
     
  4. keith204

    keith204 No longer a newbie, moving up!

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    The white papers for the 40D say the sensors are actually different. The 40D's sensor is based on the 400D's, but the 40D's sensor had more improvements. Mainly, these improvements were to handle higher ISOs much better than the XTi.

    The 40D white papers say: "Although the EOS 40D’s single-piece CMOS sensor is based on the Canon EOS Digital
    Rebel XTi’s (400D ) sensor design and manufacturing technology, new processes were incorporated
    in the CMOS semiconductor fabrication and microlens-forming process. By improving
    light-collecting efficiency, the same ISO range and low noise (S/N ratio) as that of theEOS 30D were attained even though the pixels on the 30D are larger."


    The 400D and 40D both have a 1.6x crop factor.



    I have to say, in owning the 40D, the biggest advantage (personally, for me) isn't the image quality, but the overall feel/appeal of the camera. I upgraded from the XT. Yes, the IQ is better on the 40D, but that wasn't the selling point for me.
     
  5. Peanuts

    Peanuts TPF Noob!

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    Okay that must have changed. I believe the 350D and 20D had slightly different crop factors. THere you go, learn something new every day!
     
  6. keith204

    keith204 No longer a newbie, moving up!

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    :) did they? I'm still thinking 1.6x... :)
     
  7. 250Gimp

    250Gimp TPF Noob!

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    I have the 350D and it is a 1.6x crop factor. I believe the 20D is as well.
     
  8. Peanuts

    Peanuts TPF Noob!

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    I've lost my marbles then :lol:
     
  9. keith204

    keith204 No longer a newbie, moving up!

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    Sometimes you learn something new TWICE a day! :thumbup: Maybe you were thinking about the Nikon vs Canon crop sensor crop factors. Isn't the Nikon D40/D40x/etc a 1.5x? It all gets confusing.
     
  10. Peanuts

    Peanuts TPF Noob!

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    Nope. It was definitely between the 20D and the 350D I was thinking - although I should just use your suggestion as an excuse *smiles and nods*
     

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