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PostPosted: Sun Oct 18, 2009 9:45 pm 
Hello,
I'm a new Nikon d40 owner, and right now just have the basic kit lens (18-55 mm). I'm looking for a 300mm zoom, and right now the nikon vr is way out of my price range. I'm thinking about the Sigma 70-300 f/4-5.6 DG APO, but then came across the Sigma 28-300 mm lens. Other than the 28/70 difference, what are the other main differences between these 2? Is the 28-300 worth the extra $100?

Sigma 70-300mm f/4-5.6 DG APO Macro ($210 USD)

Sigma 28-300mm f/3.5-6.3 DG Macro ($299 USD)

I don't mind manual focusing or carrying 2 lenses and switching, so that's not an issue. I know I won't be getting a VR equivalent, but that's ok for now.

Thanks in advance for any comments.


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PostPosted: Sun Oct 18, 2009 10:13 pm 
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I'd go for the 70-300. It's a faster lens which means you won't have to crank up the ISO as often.

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PostPosted: Sun Oct 18, 2009 10:16 pm 
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70-300, definitely. Most likely better optical quality, and a faster max aperture :)

Be sure to get the APO version though, as it's optically better than the non-APO version.

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PostPosted: Sun Oct 18, 2009 10:42 pm 
Thanks for the fast answers. The 70-300 (APO version it will be!)


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PostPosted: Thu Oct 22, 2009 12:42 am 
what is the difference in APO and non Apo on 70-300mm


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PostPosted: Thu Oct 22, 2009 3:29 am 
here is the Sigma explanation of APO:

"In order to attain the highest quality images, the APO lens has been made using Special Low-Dispersion (SLD) glass and is designed to minimize color aberration.

SIGMA's APO zoom lenses minimize color aberration. As the refractive index of glass depends on the wavelength of light, color aberration occurs when different colors form images at different points. This problem often occurs with telephoto lenses, but the Special Low-Dispersion (SLD) glass and Extraordinary Low Dispersion (ELD) used in SIGMA's APO lenses helps to compensate for color aberration, thereby allowing them to produce sharp images."


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PostPosted: Thu Oct 22, 2009 11:21 am 
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Indeed. In short: APO glass gives you better imagequality than non-APO glass (in terms of chromatic abberation/ fringing, and some sharpness also).

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