Caroline, You will need to get the images orthorectified for any chance of accuracy, there are several products out there that do the trick..... ermapper and erdas imagine( both very good....i dont know of anything thats cheap AND easy), the good thing is that the 'overlap' in the stereo pair will allow for a better mosaicing and more acurate rectification, the downside is that you will correct the same area more than once to get the mosaic. Distortion varies across the images and is dependent upon a number of criteria esp the variation of the terrain, view angle of the camera and the scale of the photo image(flight height + camera settings). It may be possible to buy 'already corrected data', this is normally expensive and depending upon your needs and skills, you may prefer to DIY.
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