Lens quality question

Discussion in 'Beyond the Basics' started by kelox, May 13, 2005.

  1. kelox

    kelox TPF Noob!

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    I saw these two lenses online and for the life of me can't figure out the difference, other than the APO designation on the one. Any help on this would be nice.

    The first...
    Sigma 70-300mm f4-5.6 APO Macro Super:
    has a compact Apochromatic tele zoom lens incorporating two Special Low Dispersion glass elements in the front lens group, plus one Special Low Dispersion glass element in the rear lens group, to minimize chromatic aberration. It is a Tele-Macro Zoom lens, capable of focusing down to 1:2 (half life-size) reproduction ratio at 300mm focal length (an optional accessory 58mm achromatic close-up lens allows even closer focusing and reproduction ratios up to 1:1 or life-size) with superb optical quality.

    Mount: Minolta AF
    Lens Constructions: 10 Groups 14 Elements
    Angle of View: 34.3 degrees -8.2 degrees
    Number of blades in diaphragm: 9
    Minimum Aperture: f22-32
    Minimum Focusing Distance: 150cm / 59.1in (Macro 95cm / 37.4in)
    Magnifications: 1:4 ( 1:2 Macro)
    Filter Size: 58mm
    Dimensions (Dia x Length) 76.6 x 119.5mm / 3.0 x 4.7in (Fully Extended Length 208.3mm / 8.2in)
    Weight: 530g / 18.7oz


    The other...
    The70-300mm f/4-5.6 Zoom Macro:
    has a compact design to fit your needs while not taking up a large amount of room. It is a Tele-Macro Zoom lens, capable of focusing down to 1:2 (half life-size) reproduction ratio at 300mm focal length. The lens materials used in this new product are lead and arsenic free ecological glass.

    Mount: Minolta AF
    Lens Constructions: 10 Groups 14 Elements
    Angle of View: 34.3 degrees -8.2 degrees
    Number of blades in diaphragm: 9
    Minimum Aperture: f22-32
    Minimum Focusing Distance: 150cm / 59.1in (Macro 95cm / 37.4in)
    Magnifications: 1:4 ( 1:2 Macro)
    Filter Size: 58mm
    Dimensions (Dia x Length) 74.5 x 119.5mm / 2.9 x 4.7in (Fully Extended Length 208.3mm / 8.2in)
    Weight: 585g / 20.6oz

    Thanks to all who reply.
     
  2. Contra|Brett|

    Contra|Brett| TPF Noob!

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    APO = Nice low dispersion glass, similar to ED from nikon, typically low dispersio glass produces sharper, more contrasty images, and helps significantly reduce chromatic abberation.
     

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