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Canon 70-300 IS question.

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  • Canon 70-300 IS question.

    Im using one on my 400D and it seems to be overly soft at 300mm. I know this aint no L lens so it cant be expected to be pinsharp at that length but still I expected it to sharper than what it is. Anyone else using this lense have the same problem? Is it just a matter of deal with it and work around it or is it maybe an issue with my copy that I can get fixed?

    Cheers, Dave

  • #2
    I have the older 75-300mm lens and when I use it I avoid going beyond 200mm or so if I can possibly help it. It helps if you keep the lens stopped down to f8 or smaller.


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    • #3
      Nature of the Beast

      Dave,

      I have been using the 70-300IS for almost a year now. Its not a perfect lens but I am pretty happy with it. I find I have a lower keeper rate at 300mm than the more used 100-200mm range (Here in Newfoundland you can generally get fairly close to the runways) but at 300mm it can produce decent results, see below







      I chaulk the discrepency up to 300mm requiring a steadier hand and higher shutter speeds. I keep the lens at F8 as much as possible to stay in the theoretical sweet spot but.... I have not done tests but one of these days i got to see how much 'worse' it is at wide open.

      So long story short, set the aperture to F8 and if you routinely get soft images while still having a decent shutter speed you may have a problem with your copy of the lens. One thing I found however that will guaruntee soft photos is using mode 1 IS while tracking a moving object.

      cheers

      Mark

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