difference of APO and non-APO

[drew_viii]

hi guys, ive got a question regarding sigma's telephoto lens, the 70-300 DG MACRO, whats the difference with the APO version and non-APO? thank you :D

[JTL]

APO stands apochromatic optical...which in Sigma speak means that the lens corrected for chromatic aberrations in all three primary colors and uses three special elements to achieve this.

[drew_viii]

so that means it just fix the CA? doesnt affect the sharpness and everything right? do you think APO and non-APO lens have big differences, when it comes to general photo quality

[CptOfGondor]

Whats the price difference?

[JTL]

so that means it just fix the CA? doesnt affect the sharpness and everything right? do you think APO and non-APO lens have big differences, when it comes to general photo qualityI certainly think so. In addition to the APO design, it also has higher quality glass. And owners and reviewers seem to prefer the APO version...and for the relatively good quality, it's a teriffic bargin. Here it is for $189.95. That's the bargin of the century! It even comes with a lens hood and case...
http://www.sigma4less.com/sess/utn;jsessionid=154452f3a86aef0/shopdata/0020_Lenses/0010_Zoom/0040_Tele+Zoom/product_details.shopscript?article=0400_Sigma%2B70-300mm%2Bf%3D26slash%3D3B4-5%3D252E6%2BAPO%2BDG%2BMacro%2Bfor%2BCanon%2BAF%2B %3D28SG70300F4ADCA%3D29

Here's a review: http://www.ephotozine.com/equipment/tests/testdetail.cfm?test_id=369

Whats the price difference?I've seen the non-APO version for as little as $125...

[some guy]

I believe both use Low Dispersion glass. the price difference is about 80bux.

[JTL]

I believe both use Low Dispersion glass. the price difference is about 80bux.You are right...the APO model just includes an extra SLD element...