I've got an old cannon mvx 450 mini camcorder.

The video I shoot using the sd card is very low quality. The settings are for best quality

Also does anyone know if when using a tape [assuming I'm not going to get good quality using the card,] and after the footage is converted to something my PC understands what sort of quality will it be. I have heard both that its much below that made by a proper digital camcorder. I also heard that it will be just as good, and that the PC can read what’s on the tape without any conversion

Any one have any ideas about either problem