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04-16-2008, 01:18 PM   #1
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My new Sigma 70-300 APO DG

I picked a Sigma 70-300 APO DG up last week and as the birds have been returning here I decided to put it to the test. I took the attached pics on the MF setting on the camera (K100D) as the little beggers were moving pretty fast, mostly in hot pursuit of each other. The bird is, I believe, the eastern Phebe which have been nesting in my garage for some 30 years (not the same bird I hope!).All in all I was quite pleased. I also attached a shot of the old post office in my home town it was shot on the AF mode. All shots were hand held. The bird shots were taken at 300mm, 1/800, ISO 200, F7.1. The post office, 240mm, F10, ISO 200, AF. I used PSPX2 and processed photos with Smart photo fix.

Joe

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04-16-2008, 01:25 PM   #2
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nice bird photos
do you know what the difference between the APO and non-APO is ... i guess it's some different glass? but is it a big difference ....
04-16-2008, 01:29 PM   #3
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As far as I know the lens has a special glass element in it that improves the image over the none APO versions.
04-16-2008, 01:46 PM   #4
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The APO will reduce chromatic aberrations/color fringing in high contrast shots. For example, in the above shots, CA might show up along the edges of the branches and tower where they meet the sky.

Some examples:
http://www.nightskyinfo.com/binoculars-tests/chromatic_abberation.jpg

http://www.eskimo.com/~nanook/gallery/albums/userpics/10001/chromatic2.jpg

http://www.cs.mtu.edu/~shene/DigiCam/User-Guide/990/ON-CAMERA-LENS/Chromatic-Aberration.jpg

And an explanation:
Chromatic aberration - Wikipedia, the free encyclopedia

04-16-2008, 06:49 PM   #5
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I've found increasing the contrast makes the Sigma images a bit snappier.
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