Linked Questions

2
votes
3answers
375 views

How does time of exposure relate to aperture? [duplicate]

I was trying to derive the relation between the aperture and time of exposure. I'm taking two apertures f/2 and f/4. From the formula A α 1/√t I got, f/2 α 1/√t1 -> A and f/4 α 1/√t2 ...
67
votes
4answers
149k views

What does f-stop mean?

What does f-stop mean? Is it the same thing when people say "2 stops" for example?
26
votes
6answers
3k views

What is ETTR (Expose To The Right)?

Picking up from this answer and this question, What exactly is ETTR? How it may reduce the image noise? And how is it difference from film to digital sensors? In the answer linked above, what are the ...
12
votes
7answers
2k views

Can someone give a simple explanation of ISO?

Can someone please explain to me what ISO means in the camera settings? In an answer to a question about taking pictures at a dance party, I was told to use ISO 1600. What does that number really ...
11
votes
4answers
15k views

What is the EV scale?

I have seen an "EV" (exposure value) scale that's sometimes used to express a camera's exposure settings, or scene brightness. How exactly does this scale work?
9
votes
4answers
6k views

What is the relationship between ISO, aperture, and shutter speed?

I know digital cameras have ISO options, and that ISO is the camera's sensitivity to light, but if you set higher ISO then you can get a noisy image. I also know there are two other camera options, ...
11
votes
4answers
2k views

What filter should I buy if I wanted to do 5 min shutter speed in daylight?

What type of filter would I need to create an image such as the following: http://500px.com/photo/10158205
8
votes
2answers
2k views

What are the practical differences between the exposure settings my camera picked for me in auto mode and my own choices?

I were using Fujifilm x-t20 and I took two photos: one with 'Auto' switch on and the other with 'Auto' switch off. I compare the two and I cannot find noticeable difference. and the settings Here ...
10
votes
4answers
567 views

Are the aperture, ISO and shutter speed stops perfectly interchangeable?

Imagine you have an scene with shutter speed 1/60, f/8 and ISO 200. Then you change the configuration to get an equivalent exposure: speed 1/120, f/5.6, ISO 200 (plus one stop in speed, minus one stop ...
6
votes
5answers
5k views

What reduces blur from camera movement more: large aperture or image stabilisation?

In the reviews of lenses with image stabilisation systems there are quite often written the quality of its performance represented by the number of f-stops (2-4 f-stops). As far as I understand, it ...
8
votes
2answers
8k views

What does “N stops” mean when describing an image stabilizer?

If you ever purchased any lens with IS then you have heard this term like "3 Stop Stabilization" or "4 Stop Stabilization". Now, I am familiar with this Stop for ISO and Aperture. But this I don't ...
0
votes
2answers
9k views

How is f-stop a measure of dynamic range?

As far as I have read f-stop is a measure of the aperture. This affects the amount of area in the foreground and background which is in focus. While having a look at the dynamic ranges of cameras I ...
7
votes
3answers
8k views

How do I correctly expose a 3200 ISO film roll on a camera that allows 1600 ISO?

I just bought a 3200 ISO film roll (ILFORD DELTA 3200), and my camera (Chinon Cm-5) allows to set films up to 1600 ISO. What can I do to expose correctly? I thought of metering at 1600 and when it's ...
9
votes
4answers
9k views

How do I manually calculate fill flash?

My main flash is a Nikon SB-24, used on a Nikon D200. Hence, iTTL doesn't work. I've had no issues using A-mode (the thyristor in the flash determines flash output) or M-mode (manual on the flash) ...
6
votes
2answers
12k views

How much additional light does an f2.8 really let in?

I currently have the Nikon 18-55mm kit lens that came with my D3100, but I am looking for something that will let more light in among the entire focal range. I have been eyeing the Tamron 17-50mm f2.8 ...
5
votes
5answers
2k views

When I change the EV compensation, how will that affect my aperture, shutter speed, or ISO?

Let say that we have the following values, as an example: Shutter speed: 1/40 Aperture: 2 ISO: 1000 How can I get the EV number for this exposure, extract (or add) an EV value (0.33, 0.66 etc.) and ...
5
votes
4answers
735 views

Do flash guide numbers assume some amount of ambient light built-in?

My flash shows its potential range in meters, but is that indoors or outdoors? The question came up the other day when I was trying to work out whether fitting a diffusion dome would be suitable for ...
4
votes
3answers
3k views

Will a prime lens help me get better portraits at a wedding?

I have a Canon 600D with the EF-S 18-55mm f/3.5-5.6 IS lens. I have a friend's wedding coming soon, and I'm not sure if my zoom lens will do a good job or not. I was thinking of buying a prime lens so ...
7
votes
1answer
5k views

What are STF lenses?

What are STF (smooth transition focus) lenses? How much do they differ from other fast lenses? What artistic techniques are done with them? For example Sony has an a-mount 135mm F2.8 [T4.5] STF. What ...
4
votes
2answers
3k views

How do I calculate the number of stops between two shutter speeds?

What is the math equation to calculate the difference between two different shutter speeds in stops?
5
votes
3answers
400 views

Why are certain apertures so popular?

Popular f stops in lenses are typically f/1.2, f/1.4, and f/1.8 for portrait lenses. The reasoning behind that is pretty self explanatory. Moving up past 1.8, I see some f/2.2 lenses occasionally, ...
1
vote
1answer
885 views

Relationship between shutter speed and amount of light?

With all else remaining the same (ISO, aperture etc.) is there a way to compensate for changes in the lighting of the scene by changing the shutter speed of the camera such that the intensity of the ...
0
votes
1answer
2k views

Will the Sony FDR-AX100 really be better in low light than the Sony FDR-AX33, even though the latter has a faster lens?

I see that Sony FDR-AX100's lens has opens at f/2.8 while Sony FDR-AX33's lens opens at f/1.8 I am often doing photos (Canon 6D) or videos in places where a f/1.8 lens would be a great advantage over ...
1
vote
2answers
856 views

Does exposure compensation affect shutter speed in aperture value mode?

When I am shooting in AV/aperture value mode, and I switch to +1 EC, will it affect my shutter speed?
0
votes
2answers
1k views

Canon rebel t3i manual mode [duplicate]

How do I make the photo brighter in manual mode? When I prepare to take a photo in manual mode it is very hard to see the subject after I take the photo it is all black. Indoor and outdoor
0
votes
2answers
262 views

What is the formula to calculate aperture (“diaphragme” in French)?

Let's say I have these data for my camera: t : Exposure time in seconds ("temps de pose" in French) C : Incident-light meter calibration constant ("constante lumière incidente" in French) S : ISO ...
2
votes
3answers
163 views

I know what “stops” in an aperture are, but what are differences in stops in various light sources or areas of an image?

I understand what F-stop and T-stop mean, but I've also heard the term "stop" used like this: the background is one and a half to two stops darker than the key light What does "stop" mean in this ...
0
votes
2answers
163 views

How much light do I need for my RX10-II at 1000 fps?

I know the video mode is taking a frame "approximately" 1/1000s long, the aperture opens up to f/2.8, and the Auto ISO will select within the camera's range, 64-12800, so how much light (in the studio)...
1
vote
4answers
90 views

how many f stops should I allow for a given change in focal length - ISO and shutter speed remaining constant?

There are charts that show me what how many stops in shutter speed or ISO to allow when, for example, using an ND filter but given that a longer focal length reduces light available is there a chart ...
1
vote
1answer
102 views

How to shoot the sequence of adjusted exposures wanted for a ColorChecker?

I'm trying to shoot a sequence of photos needed for calibration. As instructed, I'm in manual mode, with fixed ISO 100 (camera dafault), and other values read from the lightmeter ... and now: Can you ...