anguslau 發表於 2008-1-31 12:08:45

Interesting astrograph

This should be an interesting astrograph:
http://www.dpreview.com/news/0801/08013101sigma250500.asp

oldfield 發表於 2008-1-31 12:29:54

Fast!Just wonder how it performs especially when it's a zoom

Raymond_Tse 發表於 2008-2-2 15:30:08

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.

fatpang 發表於 2008-2-2 23:00:24

For astro photography, you can also consider Tak E180 which is also around 500mm F2.8.
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