Please find below the comparison or difference between canon 10 Megapixel cameras SD890 IS, SD790 IS & SD770 IS. Same Features in All 3 Cameras: + 10 Megapixels resolution + Optical Image stebelizer + Motion Detection Technology (890) + Optical Viewfinder + Face Detection Technology with White Balance and Face Select & Track + Automatic Red-Eye Correction in shooting and playback + In-Camera Image Enhancement + DIGIC III Imaging Processor + JPEG, AVI, WAVE + Memory Support or storage media (SD/SDHC Memory Card, MultiMediaCard, MMC Plus Card, HC MMC Plus Card) + 4x Digital Zoom + All cameras operates on Rechargeable Lithium-ion Battery DIFFERENCE / COMPARISON BETWEEN CAMERAS Canon SD890 IS: 1. 5x Optical Zoom in SD890IS where as in SD790IS & SD770IS its only 3x.