Sensor sizes

Started 4 months ago | Questions
jimbrobb
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Sensor sizes
4 months ago

Hi,

Looking at the new Panasonic fz1000 and the sensor is described as 1".

Is that 1 inch?

Where do they get this from as it's about 13 by 7 mm. Making the diagonal about 15mm.

Also, why is the four thirds cameras described as such.

Jim

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Tony8232
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Re: Sensor sizes
In reply to jimbrobb, 4 months ago

jimbrobb wrote:

Hi,

Looking at the new Panasonic fz1000 and the sensor is described as 1".

Is that 1 inch?

Where do they get this from as it's about 13 by 7 mm. Making the diagonal about 15mm.

Also, why is the four thirds cameras described as such.

Jim

I love to know also.

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boxerman
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Re: Sensor sizes
In reply to jimbrobb, 4 months ago

This is where some of those incredibly boring historical accidents have become a permanent feature of "modern" specs. In this case, sensor sizes were modeled on (TV) tube technology, where the sensibly active area of the tube is about 2/3 of the outside diameter (OD) of the tube. (Using the edge of the tube I assume would introduce shape artifacts from rounding, or possibly pose manufacturing problems.) So, a 1" sensor means one inch, but that refers to the OD of the (nonexistent) tube that might contain an active area the same as that sensor.  SO...

jimbrobb wrote:

Looking at the new Panasonic fz1000 and the sensor is described as 1". Is that 1 inch?

Yup, but it's the OD of the non-existent tube. So, the ACTUAL sensor is about 2/3s of that, which is about 16mm. Close enough (to 15 mm you computed) for jazz.

Also, why is the four thirds cameras described as such.

Same deal. 4/3 of an inch. But, that refers to the nonexistent tube, so the sensor is actually about 2/3 of that, or about 22.5 mm.

You can read about it here:

Sensor Sizes

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s_grins
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Re: Sensor sizes
In reply to jimbrobb, 4 months ago

You can find the answer and dimensions via wikipedia.

I'm more interesting to understand relations between pound, shilling, and pence

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Dr_Jon
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Re: Sensor sizes
In reply to s_grins, 4 months ago

240/12/1

BTW unless you understand half crowns you're not even trying (12.5p today, except we don't have half-pennies any more).

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tt321
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Re: Sensor sizes
In reply to Dr_Jon, 4 months ago

Dr_Jon wrote:

240/12/1

BTW unless you understand half crowns you're not even trying (12.5p today, except we don't have half-pennies any more).

We might yet lose the whole pence, never mind the half. And the crown coin is now 5 quid.

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s_grins
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Re: Sensor sizes
In reply to tt321, 4 months ago

tt321 wrote:

Dr_Jon wrote:

240/12/1

BTW unless you understand half crowns you're not even trying (12.5p today, except we don't have half-pennies any more).

We might yet lose the whole pence, never mind the half. And the crown coin is now 5 quid.

The more I know, the less I understand!

Thank you both

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Sean Nelson
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Re: Sensor sizes
In reply to s_grins, 4 months ago

s_grins wrote:

I'm more interesting to understand relations between pound, shilling, and pence

Or that other great English mystery, the difference between the UK, England, and Britain.

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s_grins
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Re: Sensor sizes
In reply to Sean Nelson, 4 months ago

Sean Nelson wrote:

s_grins wrote:

I'm more interesting to understand relations between pound, shilling, and pence

Or that other great English mystery, the difference between the UK, England, and Britain.

Sean, I'm very grateful. I've managed to understand (in general of course) the basics of the lesson.

Cheers

S.

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Sean Nelson
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Re: Sensor sizes
In reply to s_grins, 4 months ago

s_grins wrote:

Sean Nelson wrote:

s_grins wrote:

I'm more interesting to understand relations between pound, shilling, and pence

Or that other great English mystery, the difference between the UK, England, and Britain.

Sean, I'm very grateful. I've managed to understand (in general of course) the basics of the lesson.

Don't thank me, thank C.G.P. Grey - he's the fellow who put that explanation together.  It's the clearest explanation I've seen, although it's just convoluted enough that I've usually forgotten almost everything about it by the next day...

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GeorgianBay1939
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Re: Sensor sizes
In reply to Sean Nelson, 4 months ago

Sean Nelson wrote:

s_grins wrote:

Sean Nelson wrote:

s_grins wrote:

I'm more interesting to understand relations between pound, shilling, and pence

Or that other great English mystery, the difference between the UK, England, and Britain.

Sean, I'm very grateful. I've managed to understand (in general of course) the basics of the lesson.

Don't thank me, thank C.G.P. Grey - he's the fellow who put that explanation together. It's the clearest explanation I've seen, although it's just convoluted enough that I've usually forgotten almost everything about it by the next day...

Yes, a good explanation.

I think.

I am severely affected by this:

I've usually forgotten almost everything about it by the next day...

What was the topic again?

(You, too, will recognize the symptoms in another 3-4 decades when you get to be a really old f@rt, like me!)

T

PS  I still have trouble with gas mileage for my truck: MPUSG, MPIG, litres/100km etc.   I do know that the CADs/Fill-up are increasing monotonically and quickly.

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Olymore
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Re: Sensor sizes
In reply to Sean Nelson, 4 months ago

The only important bits to remember are that the other countries don't like England. 

Don't go to Scotland, Wales and (parts of) Northern Ireland and refer to the natives as English as we tend to get hostile.

Some parts of Northern Ireland are very very proud to be part of the United Kingdom though and some parts are very very unhappy that they are not part of the Republic of Ireland.

The Scots are very happy to be friendly to anybody who are hostile to the English.

Most parts of Wales ditto, apart from the parts that are very nearly part of England which are indifferent to the whole country business.

In addition the people in North Wales think the people in South Wales are practically English anyway.

And the people in the West of Scotland dislike the people in the East of Scotland or more specifically the people in Glasgow dislike the people in Edinburgh and think the Edinburgh people think they are superior to people in other parts of Scotland

Finally everyone outside the the South East of England doesn't like London, including most parts of England.

It's quite simple really.

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Dr_Jon
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Re: Sensor sizes
In reply to Olymore, 4 months ago

So basically rather than Scotland voting in September the M25 enclosed area (i.e. Greater London) should go for independence and then everyone else will be much happier?

John

(Writing in West London )

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ScottyA
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Re: Sensor sizes
In reply to Sean Nelson, 4 months ago

Sean Nelson wrote:

s_grins wrote:

I'm more interesting to understand relations between pound, shilling, and pence

Or that other great English mystery, the difference between the UK, England, and Britain.

A Kingdom (Queendom?), one of its Countries, and the main Island.

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ScottyA
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Re: Sensor sizes
In reply to boxerman, 4 months ago

Also, why is the four thirds cameras described as such.

Same deal. 4/3 of an inch. But, that refers to the nonexistent tube, so the sensor is actually about 2/3 of that, or about 22.5 mm.

Actually, 4/3 refers to the aspect ratio of the sensor.

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Olymore
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Re: Sensor sizes
In reply to Dr_Jon, 4 months ago

You may be on to something there

Though having just watched the Commonwealth Games opening ceremony people were even cheering the English team. Probably just being polite....

As someone who's parents came from London, was born in Wales and brought up in Scotland I like to think of myself as a citizen of the British commonwealth.

I just think we would get on better if it was a commonwealth rather than one (political) nation.

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Sean Nelson
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Re: Sensor sizes
In reply to Olymore, 4 months ago

Olymore wrote:

Though having just watched the Commonwealth Games opening ceremony people were even cheering the English team. Probably just being polite....

You have to check out John Oliver's Last Week Tonight piece on the Commonwealth games.   I'm a citizen of the Commonwealth too (specifically: Canada), but I have to admit that it's pretty funny.

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boxerman
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Re: Sensor sizes
In reply to ScottyA, 4 months ago

ScottyA wrote:

Actually, 4/3 refers to the aspect ratio of the sensor.

Nope, it's size. 4/3s as an aspect ratio does not distinguish 4/3 sensors from virtually ANY sensor smaller than an APS C (which is 3/2 aspect ratio). All those sensors are 4/3 in aspect ratio. Funny way to name a sensor: characterize it in a way that does not distinguish it in any way from slews of other sensors.

You should really check your technical facts before writing. I do. Check the link I posted, or google, or check Wikipedia. The link I posted has a chart of "sensor sizes" (!), and they are even labeled inches ("). I guess the person who applauded your comment did not bother to check, either.

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joergzielosko
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Re: Sensor sizes
In reply to boxerman, 4 months ago

boxerman wrote:

Check the link I posted, or google, or check Wikipedia.

Or check the official source of information on Four Thirds: http://four-thirds.org:

"Among the main aspects of the standard, it had already been determined that the size of the image sensor would be 4/3."

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boxerman
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Re: Sensor sizes
In reply to joergzielosko, 4 months ago

joergzielosko wrote:

Or check the official source of information on Four Thirds: http://four-thirds.org:

"Among the main aspects of the standard, it had already been determined that the size of the image sensor would be 4/3."

Good point. Sometimes it's worth evaluating the quality of the source, too. I've seen crap on Wikipedia, but normally, it's pretty good.

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