SONY 500/8 REFLEX or Tamron AF 200-500 F5-6,3 Di LD IF

Discussion in 'Sony' started by Mulperi, Aug 11, 2008.

  1. Mulperi

    Mulperi Guest

    Which one is better. Yes I know that Tamron AF 200-500 F5-6,3 Di LD IF is a
    zoom lens and SONY 500/8 REFLEX is not but which one gives better photos.

    Juha Heinonen
    Seilimaki 17 B 8
    02180 ESPOO
    Mulperi, Aug 11, 2008
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  2. Mulperi

    me Guest

    First question. Will your body even AF an f/8 max aperture lens, if that is
    at all important to you?
    me, Aug 11, 2008
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  3. Mulperi

    Guest Guest

    the tamron is a decent lens and will probably produce much better
    images than a reflex lens.

    although i haven't used the sony lens, mirror lenses as a rule don't
    tend to be all that great (especially the cheap ones), with low
    contrast images and donut shaped bokeh. it's also a fixed f/8 while
    the tamron is a little faster at 500mm (f/6.3) and can stop down
    further if necessary. on the other hand, the mirror lens is lighter in
    weight and not as huge.
    Guest, Aug 11, 2008
  4. Mulperi

    John Sheehy Guest

    Mirror lenses (I am assuming that the Sony is one) have "donut" bokeh, IOW,
    any point light source that is out of focus will be shaped like a donut.
    Therefore, they only work well when most everything in the frame is at
    about the same distance from the camera. "About" allows that infinity and
    hundreds of feet are about the same, but not, say, 20 feet and 80 feet.

    John Sheehy, Aug 11, 2008
  5. Mulperi

    Guest Guest

    that's a tiny mirror lens :)
    Guest, Aug 12, 2008
  6. Mulperi

    Guest Guest

    i don't know where you got the idea that it's not a full frame lens.
    it most definitely is. also, full frame lenses that long won't be any
    lighter than a dx version. it's at the shorter focal lengths where
    cropped image circles make a difference.
    actually a number of companies made 300mm f/5.6 mirror lenses. they're
    *really* small considering they're 300mm, and f/5.6 isn't that slow
    (most consumer zooms are f/5.6 at the long end).
    Guest, Aug 12, 2008
  7. Mulperi

    Guest Guest

    the only confusing thing is the various nomenclature used by the
    different manufacturers. tamron is probably the worst with di
    (digitally integrated) for lenses with different coatings and di-ii for
    cropped sensor lenses. sigma uses dc and dg, while nikon uses dx.
    yep, it's a big lens. sigma has a number of alternatives, all of which
    are heavier. and if you really want extreme, there's the sigma
    200-500mm f/2.8, which weights something like 35 pounds. :)

    even the best converters have an impact on image quality and
    diffraction becomes an issue at f/16. plus, looking through a lens at
    f/16 (nevermind trying to focus it) is painful.
    that's about the only good aspect.
    Guest, Aug 12, 2008
  8. Plus with enough aperture to autofocus without special internal aid,
    and a useful telephoto length of 375mm on a 1.5 crop sensor. Shame it
    needs a lensed convertor to work on a Sony alpha mount.
    Chris Malcolm, Aug 12, 2008
  9. Graduated ND (center)?
    (Yes, yes, it makes everything even darker ...)

    Wolfgang Weisselberg, Aug 12, 2008
  10. The reason to have refracing lenses to perform focus is to maintain
    image quality. As you change the mirror conjugates the image quality
    drops fairly quickly.
    Helpful person, Aug 15, 2008
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