Christopher James Huff wrote:
> 
> Well, with astronomical telescopes, you will just run into precision 
> problems. This has nothing to do with how well POV simulates optics.
> 

I was refering to another effect which makes objects appear blurry in a 
telescope. I'm not sure what causes this effect, but I think it is 
bacause the mirror (a paraboloid) will focus only parallel rays (the 
object to be viewed must be either a point or ininitely far away). A 
planet is neither of both, so not all the light from the planet will be 
focused an the same plane, resulting in a blurry image. It gets better 
if you use a larger mirror (I guess that's the reason why they use 8 
meter mirrors in the VLT :-)

I'm not an astronomer, so I'm not sure about all this!

Maybe this effect can be simulated with POVs focal blur somehow, but I 
didn't get it to work.

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