I couldn't find anything in a cursory search of google and nothing in any of the links currently here explain it. Why is it 50 cameras for the effect? Each lin

I couldn't find anything in a cursory search of google and nothing in any of the links currently here explain it. Why is it 50 cameras for the effect? Each link I've seen has the same (50 cameras). I am just curious if there is a reason that the number is used instead of say 60 (every 6 degrees) or something like that? Edit: It would have been great to see it in action but there is a link elsewhere on the page that had some awesome views of what can be done.