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There must be someone who knows

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By *elix Sighted OP   Man
over a year ago

Cloud 8

There’s so much knowledge and insight in this forum community. Does anybody know the answer:-

If photographs are all rectangular, why are camera lenses circular??

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By *ad NannaWoman
over a year ago

East London

Because the sphincter that opens and closes for exposure has to be round, like an eye.

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By (user no longer on site)
over a year ago

Better light, better focus, better overall image

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By *omersetsmithyMan
over a year ago

Horfield

Scissors

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By *ull English with teaMan
over a year ago

London


"Because the sphincter that opens and closes for exposure has to be round, like an eye."

You had me at sphincter…

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By *arkandlovelyWoman
over a year ago

South Derbyshire


"Because the sphincter that opens and closes for exposure has to be round, like an eye."

Lol sphincter.

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By *ris GrayMan
over a year ago

Dorchester


"There’s so much knowledge and insight in this forum community. Does anybody know the answer:-

If photographs are all rectangular, why are camera lenses circular??"
Is it to do with convex and concave i wonder

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By *iscean_dreamMan
over a year ago

Llanelli

Because a round lense is the best way to focus light

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By *elix Sighted OP   Man
over a year ago

Cloud 8


"Because the sphincter that opens and closes for exposure has to be round, like an eye."

Ha! Sphincter.

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By *cott73Man
over a year ago

brighton

It has suddenly gone all James O'Brien Mystery Hour...

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By *elix Sighted OP   Man
over a year ago

Cloud 8


"Because a round lense is the best way to focus light"

Oo you sound like you know what you’re talking about! Tell me more

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By (user no longer on site)
over a year ago


"Because a round lense is the best way to focus light"

And the usual subject matter is in more of a panoramic field of view so it makes sense for the film to match that.

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By *heBlowinsCouple
over a year ago

West Cork

Google this question + eli5 Reddit

We *can* have rectangular lenses but it makes far less practical sense given the way light bends and the manufacturing and assembly of lenses, particularly interchangeable parts.

Add to that how cumbersome and wasteful circular formats would be to produce, e.g. paper, digital screens.

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By *rtyIanMan
over a year ago

Gateway to the Beacons

Lenses are circular in shape because this makes focusing and adjusting focal length (on zoom lenses) much simpler. This is because focusing and zooming requires changing the distance between the various pieces of glass inside the lens.

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By *ad NannaWoman
over a year ago

East London


"Because the sphincter that opens and closes for exposure has to be round, like an eye.

You had me at sphincter…"

It's one of my favourite words

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By *ris GrayMan
over a year ago

Dorchester


"Because the sphincter that opens and closes for exposure has to be round, like an eye.

You had me at sphincter…

It's one of my favourite words "
why..... Its..... Their are other more enigmatic words

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By *elix Sighted OP   Man
over a year ago

Cloud 8


"Google this question + eli5 Reddit

We *can* have rectangular lenses but it makes far less practical sense given the way light bends and the manufacturing and assembly of lenses, particularly interchangeable parts.

Add to that how cumbersome and wasteful circular formats would be to produce, e.g. paper, digital screens."

I suppose I could have just done this myself

I obviously tweaked your inner nerd haha, thanks for posting

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By *ichaelangelaCouple
over a year ago

notts

probably the same reason as why they put a round pizza in a square box

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By *elix Sighted OP   Man
over a year ago

Cloud 8


"Lenses are circular in shape because this makes focusing and adjusting focal length (on zoom lenses) much simpler. This is because focusing and zooming requires changing the distance between the various pieces of glass inside the lens."

Thanks dude, this makes a lot of sense. And I guess with the light bending thing (which I’ll never understand - too fick innit) they need to be circular.

Curiosity satisfied!

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By *iscean_dreamMan
over a year ago

Llanelli


"Because a round lense is the best way to focus light

Oo you sound like you know what you’re talking about! Tell me more "

A lense works the same way a pupil does, if our pupils weren't round then they wouldn't get the same amount of light

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By *iscean_dreamMan
over a year ago

Llanelli


"Because a round lense is the best way to focus light

And the usual subject matter is in more of a panoramic field of view so it makes sense for the film to match that. "

That is another reason

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By *elix Sighted OP   Man
over a year ago

Cloud 8


"Because a round lense is the best way to focus light

Oo you sound like you know what you’re talking about! Tell me more

A lense works the same way a pupil does, if our pupils weren't round then they wouldn't get the same amount of light "

I knew I’d get the right people involved! Thanks man.

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By (user no longer on site)
over a year ago


"Because a round lense is the best way to focus light

Oo you sound like you know what you’re talking about! Tell me more

A lense works the same way a pupil does, if our pupils weren't round then they wouldn't get the same amount of light

I knew I’d get the right people involved! Thanks man."

Yep this is the place for professionals & experts

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By *nightsoftheCoffeeTableCouple
over a year ago

Leeds

Because a rectangular lens would cause chromatic aberration and alter the image for the worse, picking up light scatter via the thickness of the edges, round lenses just like the pupil reduce aberrations and give a more focused image and an even distribution of light focus.

Mrs

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By *elix Sighted OP   Man
over a year ago

Cloud 8


"Because a round lense is the best way to focus light

Oo you sound like you know what you’re talking about! Tell me more

A lense works the same way a pupil does, if our pupils weren't round then they wouldn't get the same amount of light

I knew I’d get the right people involved! Thanks man.

Yep this is the place for professionals & experts "

Hahahaha!!! Any wally can post on wikipedia. But, Fab, on the other hand.....

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By *elix Sighted OP   Man
over a year ago

Cloud 8


"Because a rectangular lens would cause chromatic aberration and alter the image for the worse, picking up light scatter via the thickness of the edges, round lenses just like the pupil reduce aberrations and give a more focused image and an even distribution of light focus.

Mrs "

This is awesome!! I have wondered about this for years. As I've said, I could have googled it but never remember to. It was on my mind this morning and you have all stepped up my fellow fab forumites.

Knowledge fives to you all

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