I said that 24mm was approximately 1 inch. Actually 24mm would not let the edges of the sphere show. By making the approximation and then using that image size, I was eliminating the format size from the question.
'dude, you gotta start drinkin' later in the day.
Hey, you asked for it!
I do use a digital device in my photographic pursuits when necessary.
When someone rags on me for using film, I use a middle digit, upraised.