Hi all, anybody has used a Sigma 180 mm. f/2.8 APO lens? I have the chance to buy one, but I need references on using this (or another Sigma lenses) for Astrophotography. Thanks you! Vicent. _______________________________________________ Astro-Photo mailing list Astro-Photo@seds.org http://seds.org/mailman/listinfo/astro-photo