From Sigma, and yes, yes it's big alright. PMA 2007: Sigma has today announced one massive beast of a lens; the APO 200 - 500 mm F2.8 EX DG. This lens is stated by Sigma as being the worlds first Ultra-Telephoto Zoom Lens that offers an impressively fast F2.8 maximum aperture through its range. The lens also features and LCD panel with a readout of focal length and subject distance. If 500 mm isn't enough reach a dedicated 2x Tele Converter is supplied with the lens as standard and changes it into a 400 - 1000 mm F5.6. Combine that with a typical APS-size 1.5x FOV crop on a digital SLR and you've got either 300 - 750 mm F2.8 or a 600 - 1500 mm F5.6 (better have a good tripod). No news on price, availability or weight yet.