MTF's Lens Reviews

Discussion in 'Digital SLR' started by ttdaomd, Jun 8, 2006.

  1. ttdaomd

    ttdaomd Guest

    ttdaomd, Jun 8, 2006
    #1
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  2. ttdaomd

    Frank ess Guest

    Useful for those who may not have seen it; it's been around a while.
    Problem is, "This page was last updated 5 juni 2000."
     
    Frank ess, Jun 8, 2006
    #2
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  3. ttdaomd

    ttdaomd Guest

    Frank ess a écrit :

    Yah, most of my lenses are from before that era. I find it interesting
    that a lot of the old AI manual focus lenses are just as good if not
    better than their AF counterparts. Where there seems to have been
    improvement is with the zooms.

    Tien
     
    ttdaomd, Jun 8, 2006
    #3
  4. ttdaomd

    Alan Browne Guest

    It's been a favourite reference for many photographers for a long time.
    Regrettably, it is poorly maintained (although they seem to have
    fixed most of the link problems) and not up to date with lens releases
    of the past few years.

    When comparing lenses at this site it is most important to ignore the
    "weighted" score for each lens.

    Instead, compare lenses by looking at the graphs at wide open and
    stopped down (usually f/8). If the sagital and tangential sharpness
    lines are realtively smooth and close together (for each pair at
    differing resolution tests), then it is a good indication of smooth
    bokeh performance. Of course, the "higher" the curve the better, and
    esp. a lower rolloff of the curve are indicative of better, usually
    sharper glass.

    Such sites are good in the sense of their independance and that they use
    a randomly selected lens. OTOH, they only test one sample of each lens
    so you have no idea if the presented lens is an exceptionally good one
    or an exceptionally poor one ... or representative of what you might
    acquire.

    Cheers,
    Alan
     
    Alan Browne, Jun 10, 2006
    #4
  5. ttdaomd

    frederick Guest

    I guess one of the reasons that the site is not maintained / updated is
    related to the demise of 35mm film.
    There is a site at:
    http://www.photozone.de/
    Lenses are compared on a specific dslr body - it seems usually Nikon
    D200 and Canon 350d on the few reviews I looked at. Most data is for
    Canon, some Nikkor, and a few Olympus lenses, but the list is growing
    quite fast. You can't compare data such as MTF "cross-system" because of
    influence of anti-aliasing and in-camera processing, noise reduction
    etc, even if the sensor size and pixel count was the same, so there is
    little point using for example results of a Tamron lens reviewed on a
    Canon system against a Nikkor tested on a Nikon dslr. The reviews refer
    to testing of one sample - opening the doors to disputing this data
    based on sample variation. There is also some user-survey based data on
    this site - unscientific and probably subjective, but perhaps of some
    interest.
     
    frederick, Jun 11, 2006
    #5
  6. ttdaomd

    Alan Browne Guest

    If the sensor delivers less than stellar performance that is a problem
    with the sensor, filters, processing, etc. No different than testing
    with film rather than an optical bench. The film / sensor is a limiting
    factor.

    Chasseur D'Images, a french photo magazine, does test various sensors
    (body models) with various lenses and does get differing results for a
    given lens. But again, that's the sensor data doing it.

    What they are doing is turning the individual body models into impromptu
    optical benches when used with their test software (DxO Analyzer).

    A lens is just a lens. Better lenses always give better results.
    "Better" is not just sharpness.

    Cheers,
    Alan
     
    Alan Browne, Jun 11, 2006
    #6
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