Some questions about stops and exposure, and critique. K+

rtl32

rtl32

Member
Hey NS. So I understand what a stop is and the whole scheme of balance in photography between the settings. Like, I could go one stop larger in aperture and one faster in shutter speed and still get the same exposure value.

I also understand that each stops work exponentially, like magnitudes in earthquakes or your bank account interest (but they have different exponential values). I don't know where but I do know that I once read something that said as shutter speed and iso (possibly aperture?) go up, the exposure value doubles for every stop increased. Is that true? If not, please set me straight. Its easy to adjust things quickly to get correct exposures under normal conditions (portraits, sports, etc) but now that I'm doing longer stuff, its getting annoying and I want to be able to predict it beforehand.

From what I know, I'm going to go out on a limb and say that if the last stop of programmed shutter speed in my camera is 30 seconds, the next would be 60, then 120, then 240, 480, etc.

Again, correct me if I'm wrong. Please confirm/deny and correct what I have said throughout this post. Thanks!

Some of my recent work, please critique!

EZzOrR.jpg


lpQiAh.jpg
 
holy shit those shots are sick! really like the second one. where did you take these?

i don't really have knowledge on stops and exposure. sorry.
 
Seems as though I'm on the same level of knowledge regarding stops, so I can't give much insight. That being said, I love the shots! What lens did you use in each of them?
 
So you're on the right path for the formulas about f-stop and shutter speed. Traditional f-stops start at

1.4

and continues...

2.8

4

5.6

8

11

16

22

32

And traditional shutter speeds start at

1sec

and continues...

1/2

1/4

1/8

1/15

1/30

1/60

1/125

1/250

1/500

1/1000

1/2000

Now with new cameras there's so many different options between these options that can give you different results. Looking at your photos there you're already messing around with how aperture+ shutter speed +iso can give you different results especially with long exposure. Though how many seconds you hold the shutter opens depends on how much light you want in your photo, I can tell you that a 30 second exposure with the lowest iso and the highest f-stop will give you enough light for the stars to be seen, but short enough that you won't get a larger start trail that makes stars look fuzzy or obscure.

Also some key notes with f-stops

f11- partly cloudy skies

f8- shade

f5.6- cloudy

f4- sunset

I hope some of that info was useful.
 
I'm not sure you fully understand the term stop. Let me explain where it comes from...

Exposure is generally affected by three things - the shutter speed, the aperture diameter, and the ISO or film speed. They're all measured using different units, so the concept of "stops" was invented as a convenient way to compare them.

An increase in 1 stop of the exposure means that twice the light was allowed into the camera.

Shutter speed is measured in seconds and is easily related to stops. Doubling the time your shutter is open doubles the amount of light let it, thus increasing the exposure by 1 stop. Ex: A shutter speed of 1/50 is 1 stop higher (brighter) than 1/100.

ISO, or film speed, is a man made thing so it was made to be easily relatable to stops as well. Simply put, doubling the ISO will result in an increase of 1 stop. Ex: An ISO of 200 is 1 stop higher than 100.

Now since the size of the hole (aperture) isn't as quantally relatable to the amount light let into the camera as shutter speed is, f-numbers, or f-stops, were created. Most lenses' apertures are incremented by 1/3 of an f-stop at a time. In this case, adjusting your aperture by 3 increments will result in a change of 1 f-stop. Ex: An aperture of f/5.6 is 1 stop higher than f/8.

Hope that helps!
 
I only ever dabble in photography, I basically only do it if my camera dont got enough space/battery to take video. But that second photo is one of the sickest things I've ever seen and is now my phones lock screen.
 
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