At least, when set down, it wouldn't roll off the bench and out into the street, under the front wheel of a bus loaded with school children, on their way to the county rest home to cheer up the terminally ill elders causing a 47 car pile up with no survivors and causing a large toxic chemical spill .... Or you can use it as a door stop .... Must be something a square lens would be good 4.
No matter how fast I go, there's always someone slower in front of me.
There is always some diffraction from the light that reflects from the internal surfaces of a lens barrel. These are fairly well reduced in a cylindrical barrel, and the image cone, when it reaches the sensor, causes most of the diffraction interference to land outside the sensor ( a square well inside a circle),The corners of a square cross section would cause a more chaotic difraction pattern, and the image area at the sensor plane would need to be much (too much) bigger to avoid the distortion at the corners. So, why would one want to do that?
Isn't it more where the image is recorded that determines that it's square/rectangular? In an SLR the image bounces off a square mirror and is projected into a rectangular section of film.
I have this, a Tiffen multi-image filter - shot thru it while holding it in front of my digital camera.
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