Perception Correction Lenses...will digital darkroom do the work instead?

Discussion in 'Digital Cameras' started by shipwreck, Dec 8, 2003.

  1. shipwreck

    shipwreck Guest

    I am considering getting one of these lenses for my F100, assuming
    that one day soon I'll be getting a digital SLR that will accept my
    current stock of lenses.

    However, will the new digital darkroom programs adjust pictures
    already taken to change perception? If so, I can then forego the
    expense of the lens and just do it electronically.

    Thx
     
    shipwreck, Dec 8, 2003
    #1
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  2. That's _perspective_ correction.

    Get yourself a cheap digital camera (or film scanner) and try it yourself. I
    find it less of a panacea (and harder to do) than the tutorials on the net
    make out. If you don't feel like shelling out for Photoshop, Picture Window
    Pro* (or almost any of the other alternatives to Photoshop) has functions
    for perspective correction. (Hint: use a tripod and make sure the camera is
    perfectly level horizontally.)

    *: http://www.dl-c.com/Temp/
    Tutorial at: http://www.normankoren.com/PWP_intro.html

    David J. Littleboy
    Tokyo, Japan
     
    David J. Littleboy, Dec 8, 2003
    #2
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  3. shipwreck

    shipwreck Guest

    Ah, yes Perspective :)

    Thanks for the info. Like the other reply, I think I might have to
    invest in the lens, as I do take quite a large amounts of these type
    shots.

    Thx
     
    shipwreck, Dec 8, 2003
    #3
  4. I am considering getting one of these lenses for my F100, assuming
    Paint Shop Pro, for example, will do this very easily, but you will loose
    some resolution as the pixels in the narrower part of the image will be
    stretched to correct the perspective. So ensure that there are enough
    pixels to start with for the end resolution that you want.

    Cheers,
    David
     
    David J Taylor, Dec 8, 2003
    #4
  5. shipwreck

    Mark Johnson Guest

    I used to have one, a perspective control lens. Really neat. The
    obvious advantage is that that's where you are getting the light.
    That's your original source and photo. So if you straighten up the
    buildings there you bring in more of the scene on the sides. If you do
    it in software, you'll have to crop away at the bottom, because just
    background color will be dragged in at the top.
     
    Mark Johnson, Dec 8, 2003
    #5
  6. shipwreck

    shipwreck Guest


    Yeah, I got it wrong...perspective. Looks like I'll have to go get
    the lens. Does anyone know if they work on DSLR's like the D100? I
    have an FE and F100 just in case they don't.
     
    shipwreck, Dec 8, 2003
    #6
  7. A Perspective Correction lens basically allows you to shift the lens
    vertically so you can capture images that extend further above than
    below the camera, without tilting the camera. This keeps vertical edges
    parallel, and it also keeps the plane of best focus vertical.

    If you use a conventional camera and non-PC lens tilted upwards, you get
    converging vertical edges and you may also have problems getting the
    whole building face in sharp focus since the plane of best focus is now
    tilted. An image editor can correct the first problem but not the
    second.

    Dave
     
    Dave Martindale, Dec 8, 2003
    #7
  8. If you use a conventional camera and non-PC lens tilted upwards, you get
    However, with a small-sensor digital camera used outdoors, lack of
    depth-of-field is unlikely to be a problem....

    Cheers,
    David
     
    David J Taylor, Dec 8, 2003
    #8
  9. Certainly true. However, if he was thinking of buying a PC lens, he
    must have an SLR, so DOF is an issue.

    Dave
     
    Dave Martindale, Dec 8, 2003
    #9
  10. shipwreck

    shipwreck Guest

    I was thinking about my FE.


     
    shipwreck, Dec 9, 2003
    #10
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