Interesting astrograph
This should be an interesting astrograph:http://www.dpreview.com/news/0801/08013101sigma250500.asp Fast!Just wonder how it performs especially when it's a zoom Most tele photo lens suffers serious comas and field curvature at the corners. Some obvious chroma aberrations may appear too.
Their target group of buyersis daytime shooters,not astro imagers. For astro photography, you can also consider Tak E180 which is also around 500mm F2.8.
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