What is the difference between these 2 lenses besides the price?


Msalicat 9 3 South Africa
28 Sep 2010 11:28AM
Sigma 70-300mm F4-5.6 DG Macro for Pentax
With a 70-300mm focal length,(105 - 450mm in 35mm format) this Powerful telephoto is good for portraiture and more scenic field sports and scenic wildlife shots. Capable of macro photography, this lens has a 1:2 maximum close-up magnification at the 300 mm focal length.

It’s the ideal high performance lens for portraits, sports photography, nature photography, and other types of photography that frequently use the telephoto range. It also has a switch for changeover to macro photography at focal lengths between 200mm and 300mm with a maximum close-up magnification from 1:2.9 to 1:2.SLD (Special Low Dispersion) glass in this lens provides excellent correction of chromatic aberration

Technologies

DG (Digital) Lenses:
The most suitable lenses for 35 mm film single-lens reflex cameras, as well as for digital SLR cameras. Sigma’s development of the DG (Digital) range of lenses has concentrated on the correction of distortion and aberrations. Magnification of chromatic aberration is particularly conspicuous with digital cameras. The optical designs and cutting-edge technology incorporated by Sigma eliminate flare and ghosting from the image sensor and create excellent color balance. Vignetting is minimized whilst marginal illumination is ensured. These high performance lenses are equally suited for digital and analogue cameras.

Basic Specs

Minimum Aperture: F22
Minimum Focusing Distance: 150cm / 95cm(Macro mode)
Dimensions: 76.6mm X 122mm
Weight: 545g

Filter Size 58mm





Sigma 70-300mm F4-5.6 DG APO Macro for Pentax
This lens has two SLD (Special Low Dispersion) glass elements in the front lens group and one in the rear lens group for correction of chromatic aberration throughout the entire zoom range. It is capable of macro photography with a 1:2 maximum close-up magnification at the 300 mm focal length.

It also has a switch for changeover to macro photography at focal lengths between 200 mm and 300 mm. It's the ideal high performance lens for portraits, sports photography, nature photography, and other types of photography that frequently use the telephoto range.

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Metalhead 12 1.9k 2 England
28 Sep 2010 11:47AM
It's the "APO" bit. Have a read at this

In basic terms, the APOchromatic lens helps to reduce colour fringing between high contrast scenes, such as dark trees branches set against a bright sky. Occasionally you'll see a purple edge where the dark part meets the light part. This lens helps to reduce that effect over the standard non-APO 70-300mm.
cats_123 Plus
16 4.9k 29 Northern Ireland
28 Sep 2010 11:55AM
I have one of these only the Nikon fit....(APO that is). I understood that you needed the APO version to be able to use auto focus in the lens.

anyway...best lens I've bought so far, very adaptable
Msalicat 9 3 South Africa
28 Sep 2010 1:33PM
Thank you so much for your help! As a beginner it's nice to have things explained in laymans terms. Grin

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