Typically, you don't want your image to change just because you render
a high quality version of it. If you want the image with more pixels to
also reveal more of the scene you need to adapt the camera settings.
Using an ortographic camera you can simply scale the right and up
vectors of the camera linearly with the number of pixels (in your
example by 500/300). With a perspective camera you could try
newangle = atan((500/300)*tan(oldangle)), but that's just my
guess from a scribbled triangle.

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