What happens when a photographer with an old photograph machine turns the objective clockwise or counter-clockwise?
Is the lens turned too? Or does it change lens?
I'm studying optics right now and I'm just curious
Depending where you turn, you can:
The following happens when you turn the lens (objective) on a camera (photograph machine):
In conclusion, if you discard the annoyances in bullets 1-3, then if the lens has noticeable distortion you will get a notably different image as well.