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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Measuring latitude in percent?

R

redman

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A sony rep at nab says that the f35 has 800% latitude as oposed to the f23 with 700%. So, how many useable stops does that translate in to for the f35?
Its not like I'm actually going to buy an f23, but would like to know.
-Thanks alot
 
That's rubbish talk. Seems like they have no idea of what they're talking about.
But what to expect from a SONY rep... :wink:
 
In the FreshDV video Podcast with Jan Crittenden of Panasonic, she states one of their cameras "goes up to 500%" dynamic range as well.

Don't ask me how to interpret that, however.
 
Häakon said:
In the FreshDV video Podcast with Jan Crittenden of Panasonic, she states one of their cameras "goes up to 500%" dynamic range as well.

Don't ask me how to interpret that, however.
Click to expand...

Hi,

Sony have used this terminology for years, the original DVW 700 went to 400% about 14 years ago.

Stephen
 
redman said:
A sony rep at nab says that the f35 has 800% latitude as oposed to the f23 with 700%. So, how many useable stops does that translate in to for the f35?
Its not like I'm actually going to buy an f23, but would like to know.
-Thanks alot
Click to expand...

800% is 3 stops (2^3=8.0)
 
maybe he was saying 800% more than f23 because the f23 has around 12 stops.(compared to 3 of course.)
 
redman said:
maybe he was saying 800% more than f23 because the f23 has around 12 stops.(compared to 3 of course.)
Click to expand...

Sorry, my educational patience has ran out.

Go and look at the picture if you are unable to understand basic technical terms and concepts. Even more so comparing them and drawing conclusions.
 
big lebowski said:
That's rubbish talk. Seems like they have no idea of what they're talking about.
But what to expect from a SONY rep... :wink:
Click to expand...

As much as I hate Sony and their reps, he gave a perfectly accurate and useful information.

Your ignorance makes you look like a moron, not him. If you don't understand something, it is OK to ask or find out yourself (good start would be here: http://en.wikipedia.org/wiki/Exposure_latitude ). But to ridiculate someone because you have NFI what they are talking about?:mail1:

Now I can understand why Jim has no time for many of timewasters frequenting this place.
 
karapetkov said:
And... what does it mean? :)
Click to expand...

2 stops

In case you can't multiply two by two, here is a hint for you:

2 ^ 2 = 2 x 2 = 4.0 = 400%

Sometimes I wonder, why make such camera affordabe to masses?
 
HM... I am ignorant here, so bear with me.

DR/Latitude (even though they are different beasts) are as far as I have understood relative numbers where for example white = 1 and black = 0, and the higher the value of DR, the more nuances you can have in between.

If this is true, the % measuring does not make sense.

If on the other hand these are absolute numbers...

But how could they be?

But, please enlighten me, this is not meant as a bashing question at all.

Gunleik
 
gunleik said:
HM... I am ignorant here, so bear with me.

DR/Latitude (even though they are different beasts) are as far as I have understood relative numbers where for example white = 1 and black = 0, and the higher the value of DR, the more nuances you can have in between.

If this is true, the % measuring does not make sense.

If on the other hand these are absolute numbers...

But how could they be?

But, please enlighten me, this is not meant as a bashing question at all.

Gunleik
Click to expand...


First you need to understand what Dynamic Range is ( http://en.wikipedia.org/wiki/Dynamic_range ). Simply put it is a distance between darkest and lightest areas that the camera can reproduce. Black is never 0. Your camera needs much more than that before it can reproduce something.

In film, DR is often expressed in stops, but could be expressed in %, where each stop is 100%, or double (2 ^ 1).

The Latitude is the extra margin that you can overexpose above the upper bound of the DR: the "safety margin", if you like. Beyond that, it is all clipped without detail.

800% Latitude, means 8 times overexposure, or +3 stops, as in 2 * 2 * 2 = 2 ^ 3 = 8 times over and above the upper limit of DR.

I don't know how to put it more simply. If this is insufficient, Google it.
 
CraigWB said:
It's even an adjustable level on the new Varicam's menu.
Click to expand...

Yep, that's perfectly accurate term, useful and simple to relate to. :whistling:
 
Pawel Achtel said:
First you need to understand what Dynamic Range is ( http://en.wikipedia.org/wiki/Dynamic_range ). Simply put it is a distance between darkest and lightest areas that the camera can reproduce.
Click to expand...

Actually, Gunleik is right, and technically speaking dynamic range (DR) is not the "distance between darkest and lightest areas"; that would be range. DR is the number of units that you chop up that range into, essentially a ratio of range divided by the smallest measurable quantity.

And the Wikipedia link that you cite clearly states that, which I am reproducing below:

"Dynamic range is a term used frequently in numerous fields to describe the ratio between the smallest and largest possible values of a changeable quantity"
 
Joofa said:
Actually, Gunleik is right, and technically speaking dynamic range (DR) is not the "distance between darkest and lightest areas"; that would be range. DR is the number of units that you chop up that range into, essentially a ratio of range divided by the smallest measurable quantity.

And the Wikipedia link that you cite clearly states that, which I am reproducing below:

"Dynamic range is a term used frequently in numerous fields to describe the ratio between the smallest and largest possible values of a changeable quantity"
Click to expand...

What was he exactly right about? He asked questions.

Why are you saying DR is not a range? DR is a Range, as the name suggests!

My explanation, although intentionally simplified, was correct and not contradicting what you cited.

DR is a distance measured (as a ratio) using either log scales (stops) or linear scale expressed as %. Likewise, Latitude is also a distance (or range) expressed in either log scales (stops), or liner as %.

Either way it is correct to use either log or liner scales to measure DR or Latitude and my point was that Sony rep was accurate and helpful providing it as he did: using linear scales as %. The fool was the one that dismissed the answer.

Some clowns on this forum refer to and compare numbers they have NFI about. Some (most) of them feel quite strongly about those numbers and often dismiss competitive products based on those numbers that they don't understand. They often demand some numbers to be higher (or lower) regardless whether it is or isn't a problem. This serves no good.

I strongly oppose such uneducated views or demands and thus my harsh responses above :angry03:

The aim of this forum is to keep it professional and objective and lack of fundamental education is not tolerable, even to ridiculate a Sony rep :bleh:
 
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