What Does Stopping Down Mean In Photography

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What does it mean to cease up or stop down? – Discontinuity


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    NedM

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NedM

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  • #1
I may audio like a complete noob but don’t go me incorrect I understand the aperture quite well.

It’s just sometimes whenever I’m watching videos on photography or when I hear someone say, “For this side by side scene, we are going to accept to adjust our aperture a stop upwards or down.”
The said person so adjusts his f/number, oh lets say from, f/5.half-dozen to f/eight.

That’southward when I’m caughtoff guard because I have no inkling how much a stop upwardly/down is!?

Or… Do I have this all wrong and whenever you’re changing the aperture either higher or lower the term for that is just stopping upward/down?

Please elaborate!

I practice also run across this whenever someone is likewise talking about the shutter speed likewise!
Where can I learn more about this?


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  • #2
Up = more exposure (lighter) Downward = less exposure (darker) Stop = stops of aperture.

And so going from F5.six to F8 would be stopping down. The bigger the number, the smaller the aperture size (the pigsty is smaller and lets less light in)

I hope I’1000 non insulting your intelligence, merely explaining in a simple fashion.

NedM

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  • #3
Up = more exposure (lighter) Downwardly = less exposure (darker) Stop = stops of aperture.

So going from F5.half dozen to F8 would be stopping down. The bigger the number, the smaller the aperture size (the hole is smaller and lets less lite in)

I promise I’m not insulting your intelligence, simply explaining in a uncomplicated manner.

No, no, not at all!
I hateful, this was the only thing about the aperture that always dislocated.

But understanding the terminology.

So, going from F5.half-dozen to F8 or F11 would be stopping downward?
There’s nothing else to it?
Information technology’s but a term used for when adjusting the aperture so?

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  • #4
Upwardly = more exposure (lighter) Downward = less exposure (darker) End = stops of aperture.

So going from F5.6 to F8 would be stopping down. The bigger the number, the smaller the aperture size (the pigsty is smaller and lets less low-cal in)

I hope I’m not insulting your intelligence, just explaining in a simple way.

No, no, non at all!
I mean, this was the but thing nearly the aperture that ever confused.

Just agreement the terminology.

So, going from F5.6 to F8 or F11 would exist stopping downward?
There’south nothing else to it?
It’s just a term used for when adjusting the aperture and so?

for that conversation yes, just exposure in general is measured in stops. Heres a couple better explanations than I take time to type. lol

Photography 101.iv – Exposure and Stops – Digital Photography School

A Tedious Caption of the f/terminate

NedM

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  • Thread Starter
  • #v
Up = more than exposure (lighter) Downwardly = less exposure (darker) Stop = stops of aperture.

So going from F5.6 to F8 would exist stopping down. The bigger the number, the smaller the aperture size (the hole is smaller and lets less calorie-free in)

I hope I’m not insulting your intelligence, just explaining in a elementary mode.

No, no, not at all!
I mean, this was the only matter about the discontinuity that ever confused.

Just understanding the terminology.

And so, going from F5.6 to F8 or F11 would exist stopping down?
There’south zippo else to it?
It’southward just a term used for when adjusting the aperture then?

for that conversation yes, but exposure in general is measured in stops. Heres a couple improve explanations than I have time to blazon. lol

Photography 101.4 – Exposure and Stops – Digital Photography Schoolhouse

A Tedious Explanation of the f/stop

And then HELPFUL, Cheers!

KmH


  • #half dozen
A ‘cease’ is a doubling (2x) or a halving (0.5x) of the amount of low-cal and a stop is a fundamental photography concept.
A stop change in exposure can also apply to shutter speed and ISO.

Since exposure is a triad of adjustments (shutter speed, ISO, lens aperture) you can modify 1, ii or all 3 of the triad settings.

If yous want one more than finish of exposure (brighter) you lot can adapt simply 1 of the 3 by 1 more stop.
Or, you tin change ii of the three by ane/2 more stop each for a cyberspace gain of 1 end of exposure.
Or, you tin can adjust all 3 past 1/3 more stop for a net proceeds of 1 stop of exposure.

You tin can also change the triad of settings and have no change in the exposure.
If yous change 1 of the 3 settings by one stop more exposure and alter a 2nd setting by 1 stop less exposure the internet change is cypher.
Suppose you subtracted a stop of shutter speed to help stop field of study motility, you could add together a stop of lens discontinuity to keep the exposure the same. However, adding a stop of aperture will also effect the total DoF by a small amount. And so, if you don’t desire the DoF to modify y’all would add a stop of ISO instead, However, adding a stop of ISO will increment by some corporeality the image dissonance in the photo.

Note: DSLR cameras are set by default to accommodate the exposure settings in 1/3 stop increments.

Most DSLR cameras let you change that to one/2 stop or 1 stop increments.
Even so, the advantage of 1/3 stop step increments is more precise control of exposure.

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  • #vii
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
== WHAT HE SAID ==

I couldn’t have said it better, or more than thoroughly.

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  • #8
The term “finish” comes from the days of industrial machines when levers or dials would take teeth or indentations to allow it to lock the lever at a specific positions. It “stopped” the lever. Today, everything is electronic, but we yet call them “stops”.

A full terminate represents either a halving or doubling of the amount of low-cal collected. Most photographic camera apertures accommodate past ane/3rd finish increments.

The social club of stops is based on powers of the square root of 2. This is because the “f” in f-stop stands for “focal ratio” and the value is the number of times that the diameter of the clear aperture can be divided into the focal length of the lens. E.grand. if your lens has a 100mm focal length but the articulate aperture is 50mm wide then y’all are using “f/2” because 100 ÷ 50 = 2. If you decrease the size of the clear aperture so that it’southward only 25mm wide so you have f/4. Notice how the diameter of articulate aperture got smaller… simply the f-value got larger (a smaller opening divides into the full focal length more than times.)

The order of “full” f stops is based on the powers of the square root of ii. This is because the formula for the area of a circumvolve is: expanse = pi * radius^2. And so if you have a 25mm bore area, so the radius is 12.5mm. 12.5^2 = 156.25. 156.25 * pi = 490.87. So the “area” of the circle is 490.87 square millimeters.

If you increase the diameter of that circumvolve by the square root of 2 (about i.41) then you become: 12.5 * 1.41 = 17.68. 17.68^2 = 312.5. 312.five * pi = 981.75.

NOW… notice how we increase the diameter of the circle past the foursquare root of 2 (i.41) and the Area of the circumvolve EXACTLY DOUBLED. 490.87 ten 2 = 981.75 (really 981.74 simply simply considering I truncated the digits of precision. It actually is exactly double… not merely close to double.)

By doubling the surface area of the discontinuity opening, y’all double amount of calorie-free that tin can flow through. This ways each time yous alter the f-cease by a gene based on the square root of 2 (whether upward or downward) you are always exactly halving or doubling the amount of light.

In photography, these values are rounded off to simply 1.4 but it really is intended to be the square root of 2.

The gild of “total” f-stops is: f/i, f/one.4, f/2, f/ii.viii, f/4, f/5.6, f/8, f/11, f/xvi, f/22, f/32…

f/one.0 = one.4 raised to the 0th power
f/i.four = 1.4 raised to the 1st power
f/2.0 = 1.4 raised to the 2nd ability
f/2.viii = 1.iv raised to the 3rd ability
f/4.0 = i.iv raised to the 4th ability
f/five.six = 1.4 raised to the 5th ability
f/8.0 = ane.4 raised to the sixth power
and we could go along going with f/xi, f/16, f/22, and f/32 (and fifty-fifty college only most lenses cannot stop down beyond f/32… a few tin). Discover that all we do is enhance the ability by 1 and this halves the amount of low-cal (as f-stop values go bigger, the aperture gets smaller).

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  • #9
The photographic term stop comes from
Waterhouse stops, which were minor metal plates that were drilled with a hole. Different-sized stops were inserted into a slot on the lens barrel, as a way to control the size of the calorie-free-albeit discontinuity. The adjustable “iris diaphragm” was invented afterwards. The Waterhouse stop organisation was invented in the tardily 1850’due south.

“Stopping the lens down,” has always meant using a
small-diameter
aperture. “Opening the lens upwards,” has always meant using a wider-bore aperture.

Here is a spider web folio that shows an erstwhile lens in a brass barrel, and a set of Waterhouse stops for that lens. http://www.skgrimes.com/products/shifting-mounts

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  • #11
Great info, someone should make a sticky out of this :thumbup:

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  • #12
Aperture settings actually are counterintuitive. Larger numbers hateful smaller hole, downwardly means more light and upward means less.

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  • #13
Aperture settings really are counterintuitive. Larger numbers mean smaller pigsty, down means more light and upwards means less.

I have taught a few beginners by using the idea that f/strops are Partial, then a larger denominator means a smaller lite-admitting hole.

Using a lens similar an 135mm, I’ll show them a 1/two dollar coin, for “f/2” and then movement to “f/4”, and telephone call that “1/4” or “i-quarter”, and show them a 25 cent coin.

Then introduce a Usa dime, and call that ane/10th…since the hole is small. They seem to get it. Half, quarter,tenth. Pretty unproblematic.

It’s just like
gauges, in shotguns, or in wire, or whatsoever…the “Low gauges” are the big stuff, the 28-judge is the inky-dinky shotgun or the tiny wire…

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  • #14
That’southward is actually a practiced example.

But what lensman has $.85 laying around?

KmH


  • #15
They aren’t counter-intuitive when 1 realizes they are fractions/ratios, and f/2 is a bigger number than f/16 is.

The f/number is a ratio of the lens opening compared to the focal length of the lens. Put another way: f = the lens
focal length.

Lets use some numbers that will keep information technology easy to understand.
If the lens has a focal length of 100 mm, and then when prepare to f/iv the lens opening is 25 mm wide – 100 mm/4 = 25 mm
If the lens has a focal length of 100 mm, then when set up to f/ii the lens opening is fifty mm broad – 100 mm/2 = 50 mm

If the lens has a focal length of 50 mm, then when fix to f/iv the lens opening is 12.5 mm wide – 50 mm/ 4 = 12.v mm
If the lens has a focal length of fifty mm, so when fix to f/two the lens opening is 25 mm broad – fifty mm/ii = 25 mm

The classic full stop steps of aperture, equally mentioned, are –
f/1, f/1.4, f/2, f/2.viii, f/iv, f/5.6, f/8, f/11, f/16, f/22, f/32 . . .


Find that f/ii is two stops from f/iv, non 1 stop
.
To halve or double the amount of light the lens aperture lets in we have to halve or double the lens aperture

AREA
, not the lens discontinuity bore.
To stop upwards or stop down the lens aperture a full cease we have to alter the area of the lens aperture opening by


the square root of 2
, which is 1.4142…….. Square root of two – Wikipedia, the free encyclopedia

Then 1 ten ane.4142 = ane.4142 – and gets rounded to f/1.4
two times smaller lens discontinuity surface area and so is – f/1.4 ten 1.4142 = 1.9799 – and gets rounded to f/two
f/2 ten 1.41412 = ii.828 – or f/ii.8
f/2.8 x ane.4142 = 3.96 – or f/iv
f/four x 1.4142 = 5.657 – or f/5.6
f/5.6 x ane.4142 = 7.919 – or f/8
rf/8 x 1.4142 – xi.314 – or f/11
so forth

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