dig cameras and barrel distortion

Discussion in 'Photography' started by Wayne, Jan 20, 2006.

  1. Wayne

    Wayne Guest

    I have an Olympus D535. I need to photograph flat objects that measure
    about 5' x 5' (some are smaller) - lets say that they are pictures in large
    frames.

    The camera I have exhibits barrel distortion, something one would not see
    when taking family pictures, landscapes, etc.

    1. Are there any digital cameras (not digital SLRs) with better lenses that
    will not generate barrel distortion?

    2. If answer is: there are non, is the only way to go is via a digital SLR?
    This is what a Wolf Asst Store mngr told me today.

    3. He suggested a Nikon D50 with a out-of-this-world 60 mm lense. Kind of
    out of my $ range - or - do I not have another choice?

    Techy question. a 6 meg pixel camera, how "deep" (bits per pixel) is the 6
    meg frame? Does this same math apply to virtually digital camera? a 3.2
    megpixel (like the Olympus D535 I have).

    Regards,
    Wayne
     
    Wayne, Jan 20, 2006
    #1
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  2. The salesman has a point. On that type of pictures only quite
    expensive lenses will give acceptable distortion.

    The good news for you is that distortion is easily corrected in
    software. Look for a program called PTLens. It even has profiles for
    most common cameras and lenses.
    DSLRs often have 12-bit samples when shooting in raw mode and 8-bit in
    JPEG. P&S cameras typically use 8-bit samples. This has nothing to
    do with pixel count, although these days the high bit-depth sensors
    are likely to have a fair number of pixels as well.
     
    Måns Rullgård, Jan 20, 2006
    #2
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  3. Wayne

    Whiskers Guest

    You may find that moving back from the subject, using a longer focal
    length ('zoom in'), and not using the edges of the frame, all help to
    reduce the most annoying distortions.

    A film camera fitted with a standard or slightly long non-zoom lens (in the
    range 50 to 100 mm on a 35mm camera or 80 to 200 mm on 6x6 roll film) will
    probably have much better 'rectilinearity' than a compact digicam with a
    zoom lens, and the negatives or slides could be scanned into a digital
    system if that's important. Such cameras and lenses can be bought
    second-hand for a lot less than the price of a top-end digital SLR outfit.

    Another possibility is to find a pro, or a keen amateur, with a suitable
    studio space and kit, who could take the pictures for you.
     
    Whiskers, Jan 21, 2006
    #3
  4. Wayne

    Scott W Guest

    Most zoom lenses will have some barrel at the wide angle end and just a
    bit of pincushion at the telephoto end, there should be a point where
    there is neither.

    Scott
     
    Scott W, Jan 21, 2006
    #4
  5. Wayne

    Wayne Guest

    Interesting point - will take a few "throughout" the zoomable range - find
    optimum as you suggest. Thank you!
     
    Wayne, Jan 22, 2006
    #5
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