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Interesting astrograph

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發表於 2008-1-31 12:08:45 | 顯示全部樓層 |閱讀模式
This should be an interesting astrograph:
http://www.dpreview.com/news/0801/08013101sigma250500.asp
發表於 2008-1-31 12:29:54 | 顯示全部樓層
Fast!  Just wonder how it performs especially when it's a zoom
發表於 2008-2-2 15:30:08 | 顯示全部樓層
Most tele photo lens suffers serious comas and field curvature at the corners. Some obvious chroma aberrations may appear too.

Their target group of buyers  is daytime shooters,  not astro imagers.
發表於 2008-2-2 23:00:24 | 顯示全部樓層
For astro photography, you can also consider Tak E180 which is also around 500mm F2.8.
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