Time for me to sell this baby. It is extremely sharp at all focals wide open, OS does a very good job for hand-held shooting. I am including mated 1.4x and 2x Sigma APO converters with this kit. Lens remains incredibly sharp with either converter, and in fact I can not detect any image quality deterioration with the 1.4x, and only the slightest loss with the 2x, most of which appears to be camera movement at 600mm. Lens and converters are in excellent condition showing barely any signs of use -- the fact is I only ever used it for a few wildlife and bird shoots. Includes factory storage case, hood and caps. Converters are also with caps as new.
Asking $2495 for the complete kit.