If lens are round, why do we take rectangle pictures?

First, humans see horizontally, so a horizontally-oriented picture is what we usually prefer.
Second, 35mm film evolved from movie films at the time, and those happened to have a 24x36mm recording surface. Most digital SLRs evolved from 35mm SLRs, so they kept the 3:2 ratio, Olympus being the exception since they like 4:3 for some reason.

Medium format films come in all sorts of sizes, both rectangular and square, since it was intended for photographic purposes from the start.

toxic wrote in post #9401145
First, humans see horizontally, so a horizontally-oriented picture is what we usually prefer.
Second, 35mm film evolved from movie films at the time, and those happened to have a 24x36mm recording surface. Most digital SLRs evolved from 35mm SLRs, so they kept the 3:2 ratio, Olympus being the exception since they like 4:3 for some reason.

Medium format films come in all sorts of sizes, both rectangular and square, since it was intended for photographic purposes from the start.

Actually, 35mm movie film originally had 24×18 frames, as it was shot across the film, not along the film.

Framing and/or matting has had all kinds of shapes. Oval was popular for a long time.

and Neil, as far as making hexagonal frames goes, one the framer has set his jig to 30°, the rest is easy.

And looking at the other side of the coin, has anyone considered the difficulties that would be involved in grinding glass for true rectangular lenses?

xs5875 wrote in post #9400664
Why is Bologna round....and bread square?

touche.

Wendy's puts square burgers on round buns.

savoirferret wrote in post #9402595
Wendy's puts square burgers on round buns.

I used to eat at Wendys, and now I don't

Square lenses? No thanks

http://www.space15twen​ty.com …/Cool,Casual,gl​asses3.jpg

Why is the sky blue?

"Why do they call it Ovaltine? The mug is round. The jar is round. They should call it Roundtine."

Seamaster007 wrote in post #9413013
Why is the sky blue?

Rayleigh scattering.

funlovincamera wrote in post #9413046
"Why do they call it Ovaltine? The mug is round. The jar is round. They should call it Roundtine."

Ovaltine: from ovum, Latin for "egg", and malt, originally its main ingredients.

See here: http://en.wikipedia.or​g/wiki/Ovaltine

20droger wrote in post #9413174
Ovaltine: from ovum, Latin for "egg", and malt, originally its main ingredients.

See here: http://en.wikipedia.or​g/wiki/Ovaltine

Please do not inject truth and logic into another horrid thread that should never have come up

How about binoculars? Round eyepiece and round view. See ya around

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funlovincamera wrote in post #9413046
"Why do they call it Ovaltine? The mug is round. The jar is round. They should call it Roundtine."

It makes kids into ovals?.....Just a thought.

440roadrunner wrote in post #9413313
Please do not inject truth and logic into another horrid thread that should never have come up

My bad! I should know better!

Tim S wrote in post #9414350
It makes kids into ovals?.....Just a thought.

They do that quite nicely by themselves these days.