Linked Questions

5
votes
4answers
761 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 ...
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
3answers
446 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, ...
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 ...
4
votes
2answers
4k 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?
2
votes
3answers
489 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 ...
2
votes
3answers
173 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 ...
1
vote
1answer
942 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 ...
1
vote
2answers
876 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?
1
vote
4answers
111 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
106 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 ...
0
votes
2answers
10k 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 ...
0
votes
2answers
436 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 ...
0
votes
2answers
170 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)...
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 ...

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