Aspherical Lens??

Discussion in 'Photography Equipment & Products' started by rmh159, May 2, 2007.

  1. rmh159

    rmh159 TPF Noob!

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    I was browsing Adorama.com this morning for a new standard zoom lens (I'm looking for a 2.8 Nikon mount lens if anyone has a suggestion... $500-ish) and noticed a few lenses had "Aspherical" in the description. Could someone explain what it is and if there are benefits / drawbacks to it?
     
  2. RMThompson

    RMThompson the TPF moderators rock my world!

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    It's a favored trait to reduce the amount of distortion:

    Wikipedia:
     
  3. JDP

    JDP TPF Noob!

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    If I remember correctly, the lenses that are hand ground & polished are labeled Aspherical by Nikon. Though technically, all lenses are aspherical.
     
  4. rmh159

    rmh159 TPF Noob!

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  5. JDP

    JDP TPF Noob!

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    Ah, that's the lens I'll be getting fairly soon, unless I decide to fork out the dough for the Nikon version. Heard nothing but good things about it.
     
  6. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    Great lens, I've got one.
     
  7. fmw

    fmw No longer a newbie, moving up!

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    Aspherical lenses don't look anything like spherical lenses at all. They are a completely different animal and that difference has nothing to do with polishing. It has to do with the shape of the lens. As mentioned above, their purpose is to better correct optical aberrations than spherical lenses.
     

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