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Occasional Contributor
Posts: 16
Registered: ‎04-17-2013

Re: Old Canon DSLR

The nature of lenses is like that of your eye - round. I don't know that they could make a square (or rectangular) piece of refractive glass. And then there would be the problem of how aperture blades would function. And the nature of paper and camera sensors and computer screens is rectangular. I imagine it wouldn't be very efficient to manufacture round sensors, screens or paper. So, the lens throws a round image and the sensor crops it square. And some sensors crop more than others. Smiley Happy
Respected Contributor
Posts: 1,298
Registered: ‎03-01-2014

Re: Old Canon DSLR

ty ebiggs, thats interesting so if I am right the square mask inside the mirror box removes part of the circle outside of the square which I never see anyway though the veiwfinder or LCD.

And yes the lighbulb went off when you said we expect square pictures and produce square pictures !

I would guess manufacturers do not think it is worth the time or effort to produce a line of square lens cameras to go along with the square mask, square sensor and resulting square or rectangular photo.

Honored Contributor
Posts: 5,007
Registered: ‎06-25-2014

Re: Old Canon DSLR


@tallrob wrote:
The nature of lenses is like that of your eye - round. I don't know that they could make a square (or rectangular) piece of refractive glass. And then there would be the problem of how aperture blades would function. And the nature of paper and camera sensors and computer screens is rectangular. I imagine it wouldn't be very efficient to manufacture round sensors, screens or paper. So, the lens throws a round image and the sensor crops it square. And some sensors crop more than others. Smiley Happy

Back before you were born (most likely), at least one TV manufacturer tried round TV screens, presumably because it's cheaper to make round CRTs. They were not well received.

Bob
Philadelphia, Pennsylvania USA
Occasional Contributor
Posts: 16
Registered: ‎04-17-2013

Re: Old Canon DSLR

[ Edited ]

@ebiggs1 wrote:

John_,

 

 

"I'm surprised at the temperature of a few responses of those who are just expressing their thoughts and experience. Luckily I'm to new debate lol !"

 

Don't be.  There is always some guy with a superiority complex that believes he must become the internet police. It is best for you to just ignor him.  I do and don't give him the satisfaction of a reply.

 

 


No offense, but from what I see you're being that guy.  There's a really good reason the term "crop" stuck and it actually serves a purpose when people want to understand why the same lens produces a narrower angle of view on an APS-C camera, and particularly in understanding why DOF appears so different (talk about a myth).  And it seems more than a little disingenuous when you use the term and then start policing people who try to explain what it means - and with a definite superiority complex.  Not sure why you're so adamant about it.  And I think you're doing your park and rec students a disservice by telling them nothing is cropped.  The image circle is definitely cropped.  And it's done more on an APS-C camera, so it's called a "cropped sensor".  Why is that so problematic for you?  

Occasional Contributor
Posts: 16
Registered: ‎04-17-2013

Re: Old Canon DSLR


@RobertTheFat wrote:

@tallrob wrote:
The nature of lenses is like that of your eye - round. I don't know that they could make a square (or rectangular) piece of refractive glass. And then there would be the problem of how aperture blades would function. And the nature of paper and camera sensors and computer screens is rectangular. I imagine it wouldn't be very efficient to manufacture round sensors, screens or paper. So, the lens throws a round image and the sensor crops it square. And some sensors crop more than others. Smiley Happy

Back before you were born (most likely), at least one TV manufacturer tried round TV screens, presumably because it's cheaper to make round CRTs. They were not well received.


Very interesting.  Yes, well before my time I think.

Honored Contributor
Posts: 5,007
Registered: ‎06-25-2014

Re: Old Canon DSLR

[ Edited ]

@John_ wrote:

I would guess manufacturers do not think it is worth the time or effort to produce a line of square lens cameras to go along with the square mask, square sensor and resulting square or rectangular photo.


Except possibly as a full-employment project for optical engineers. I presume that the various aberrations and other screwy effects one might encounter near the corners of the lens would present a challenge.

Bob
Philadelphia, Pennsylvania USA
Respected Contributor
Posts: 1,298
Registered: ‎03-01-2014

Re: Old Canon DSLR

Just thinking real quick that yes the corners would tend to cause problems with light beyond what I can explain

VIP
Posts: 11,319
Registered: ‎12-07-2012

Re: Old Canon DSLR

[ Edited ]

tallrob,

It sounds like to me anyway this is good advice to you, too.  "It is best for you to just ignor him."  No matter just whom you think he is.

 

Most of the rest of your reply I am not sure I completely understand.  But appearently you and I will have to agree to disagree on this subject. 

EOS 1DX and 1D Mk IV and several lenses!
VIP
Posts: 11,319
Registered: ‎12-07-2012

Re: Old Canon DSLR

John_,

 

This makes it all of this worthwhile to me, "And yes the lighbulb went off ..."

 

That is all I am really after.  Smiley Very Happy

EOS 1DX and 1D Mk IV and several lenses!
Occasional Contributor
Posts: 16
Registered: ‎04-17-2013

Re: Old Canon DSLR

I'll make my own decision who to ignore, thank you very much.  You really have that superiority complex down.  

 

I'm not sure on what there is to agree or disagree about.  You use a term that you oppose, and then police others who use it. You're really baiting people.  And why you can't understand the rest of my post can only be explained by a lack of trying.  Incredible.

 

wow.

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