At only 4 times zoom factor, the DMC-FS40 has a quite small digital zoom compared to most of the other digital cameras of a comparable spec and age to this camera. The average digital zoom of medium megapixel cameras that have been on the market for around the same time as this digital camera is 6.6x.
We compared all the other 4x digital zoom cameras to this camera and we think because of their better review scores, the Powershot A3500 IS, and the ELPH 115 IS both from Canon or the Nikon L120 are also worth considering.
If this digital camera digital zoom is not big enough for you then you might want to consider the Samsung 150F (5x and higher rated), or the SeaLife DC1400 Pro Duo (5x and higher rated).
What does "digital zoom" mean?