Hershel Robinson wrote:

> I have a few questions about the spheres:
> 1 The right one (even in my PPM file) appears to be out of focus.
> 2 The middle one seems slightly larger than its neighbors, but I am guessing
> that's just because it is of a lighter color than they are.
> 3 The right-most one, however, appears to be significantly larger than it
> should be.  Is this also just because of the color contrast or I am doing
> something wrong?

You are getting wideangle distortion. You can see it on the squares too.
Move the camera back, and narrow the camera angle to compensate.

/Ib

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