Compact body of Sony T90 makes it much easier to carry it with you all day. 148g
This camera is so light that you can comfortably carry it around all day. Body Thickness 15mm
With a thickness of only15mm,Sony T90 is small as it could get.
4.0X Optical Zoom
A Lens with a higher zoom ratio would make it more practical as a carry everywhere camera.
Small 1/2.3" (6.17 x 4.55 mm) sensor
Sony T90's small sensor struggles in low light situations compared to larger sensor. No RAW shooting capability
RAW files contains much more color information compared to JPEGs, and gives you more room for post processing without significant quality loss. They provide wider dynamic range and option to recover shadow and highlight clipping to some degree.