question about non-digital lenses on a digital slr

Discussion in 'Photoshop' started by Luis ORTEGA, May 24, 2004.

  1. Luis ORTEGA

    Luis ORTEGA Guest

    My understanding is that since a digital slr sensor is smaller than the area
    of a 35mm negative on some digital slrs (say the nikon d70), then using a
    lens designed for a film slr would tend to produce a better image since most
    lenses are best in the central part of their image area and that is the part
    of the image that would be captured on the digital sensor.
    does this theory make sense, or is it correct?
    Luis ORTEGA, May 24, 2004
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  2. Luis ORTEGA

    Jim Guest

    Such a lens will produce a better image in the digital slrs than it will on
    a film camera for the reason you gave.
    Whether it will produce a better image than one designed for the smaller
    image circle of the digital slr is an
    open question. One other consideration is that lenses for the digital
    format should be sharper than one for a film
    format since digital images are enlarged more.

    Jim, May 24, 2004
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  3. Luis ORTEGA

    Ken Burns Guest

    There are certain lens aberations such as light fall-off and chromatic
    aberations that are a greater issue with digital than with film. Whether
    using only the central portion of the image would solve these issues or not
    would probably vary from lens to lens. I sort of doubt that there is a
    definite yes or no answer.

    Ken Burns, May 24, 2004
  4. In spite of the claims being made by the camera and lens makers about
    "digital" lenses, the limiting factor in the resolution of a typical
    35mm or smaller image is the film or sensor. It's possible that with
    extreme wide angle lenses used on full-sized sensors there will be a
    more pronounced light fall off in the corners. But that is about the
    only case where the new designs will perform visibly better. The new
    lens designs allow for smaller and/or cheaper lenses since they need to
    cover a smaller image circle. If you already have good quality lenses
    that fit your digital camera keep using them and save your money.
    Robert Feinman, May 25, 2004
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