Is anybody aware of the dependencies for the panorama settings ?
There must be some formula to predict the result of a panorama rendering. ( This must be hidden somewhere in the code)
How one would get the settings for Camera lens 36.8, Xpart 8, SizeX 720
for a 360° panoramic view, given in the blender guide, without try & error. ?
360° / 8 (Xparts) is obviously not 36.8 camera lens. Why ?
Because lenses reports the focal length of the lenses of the camera.
a lens 16.4 is 90° wide
a lens 36.8 is 45° wide.
You make 8 parts of 45°… voilà 360° = 8 x 45°
THere must be a formula giving angle in terms of camera focal length… If I find it I’ll post.
Stefano
It’s 38.6; my fault 
You make 8 parts of 45°… voilà 360° = 8 x 45°
Yes, but only as long as SizeX > SizeY :o
This can be fixed when AspX : AspY = 2:1 but you get a distorted pic :-?
If I find it I’ll post.
Stefano
Thanks in advance 
For the easier part: It is clear that there is a reciprocal relation for Lens and viewing angle.
Very confusing for my little head. :o
I don’t know if this will help with panoramas, but I use a camera lens of 31.62 for precision modelling, because a plane 4 units wide, 4 units away from the camera, exactly fills the view.
I figured this value out by trial and error, and then discovered:
31.62 is the square root of 1000
/me tinkers a little
If I halve the lens value I get 2 units away = 4 units wide
/me does some maths
This suggests:
angle = 2 × atan (sqrt(1000) ÷ (lens))
lens = sqrt(1000) ÷ (tan(angle ÷ 2))
Interesting !
No, time to check it yet. But I will, thanks.
Here is a graph of the lens angle relation (t & e)
(trial & error not try & error; noticed 
)
I’m on the way for a few days, so don’t be angry if I don’t answer.