Alley in Pisa, Italy

by Lars Kotthoff

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Exposure is the total amount of light allowed to fall on a sensor or film during the taking of a photograph. This is determined by the exposure time (shutter speed) and amount of light admitted (lens aperture). Today, sensor/film sensitivity (ISO speed) is often also considered to be part of ...

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59 views

Why does my flash have lower power in automatic than in manual? [duplicate]

I have a Sony HVL-43AM flash. I've found that when I'm in automatic mode, when I dial the flash exposure compensation to -2EV I was able to get a much weaker flash than if I went manual with the flash ...
21
votes
4answers
2k views

How to photograph a room showing both room & view out a window?

I sometimes find I want to photograph a room showing the view outside the window. This is tricky — either you adjust the shutter speed so that the the window is so bright you can see no detail, or ...
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1answer
83 views

How is the exposure of this histogram? [duplicate]

Is exposure correct for this luminance histogram? What does this say about the dynamic range of the scene? The link is here below. It's the graph with dots. http://tinypic.com/r/b85mkj/6
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5answers
272 views

What exactly does TTL flash sets its power to?

I understand that TTL flash means the flash will preflash and try to calculate the right exposure for that particular scene. That part makes sense, but what exactly is the "right exposure"? Does it ...
11
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2answers
315 views

How can I use a histogram to expose correctly when the scene is very dark?

If I am photographing a scene with a lot of dark background, how can I use the histogram to tell if the exposure is correct? For instance, at an outdoor concert in which the performers are moderately ...
1
vote
1answer
210 views

Does Canon PowerShot G15 have manual F-number adjustment

As the question says, I have not been able to find out whether Canon PowerShot G15 has a manual F-number adjustment. I went through some reviews and specs but I haven't seen this there. I'm asking ...
3
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3answers
315 views

Why don't professional cameras have a preview for shutter speed in live view?

So far, I have been taking my pictures with a Sony F717 (a dinosaur of digital photography). Nevertheless the F717 has a nice preview feature for shutter speeds. Up to 1 sec, it simulated nicely the ...
2
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4answers
564 views

What is “Dragging the Shutter”?

Ive heard this term of "dragging the shutter" and was wondering what it means and why would i use it Can anyone answer this?
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3answers
361 views

Why did my northern lights pictures turn out totally black? [duplicate]

Trying to shoot northern lights, able to see images in my view finder eye piece, dark on live view and the pics turned out totally black. I used ISO 800-1000, 8 sec, F3.5 manual mode.
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1answer
219 views

Why is my Canon EOS 40D getting wrong exposure after focusing screen change?

I have just changed the focusing screen; something I have done now a few times. Now "normal" metering does not occur in auto or manual focus. In live view all ok. Using the eyepiece produces exposure ...
3
votes
1answer
102 views

Why do some polarizers transmit more light then others?

How do filters such as the Singh-Ray LB Polarizer transmit more light then other circular polarizers? I am particularly interested in this technology because they claim to only add 1-1/3 stop to the ...
2
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1answer
1k views

What is the shutter speed, aperture, and focal length of the Kodak Funsaver disposable camera?

I'm looking at the Kodak FUNSAVER disposable camera. Does anyone know what the shutter speed, aperture, and focal length of this camera are? Are they fixed, or do they adjust automatically?
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2answers
192 views

AEB on the Canon Rebel T2i

Hi I'm new to this whole HDR scene and I actually have a few questions regarding this. I was trying to take RAW photos with my camera set to AEB on -2, 0, and +2 exposure today with continuous shot ...
0
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1answer
87 views

Guide number and exposure [duplicate]

I am having a bit of a difficulty calculating this. Guide#= 32 feet at ISO 100 X sync speed= 1/250 Min ISO= 100 Max ISO= 800 What exposure values to expose to capture subject that's far away? What ...
4
votes
4answers
303 views

When is it realistic to take a non-flash picture of someone outside after sunset?

This is a question from a non-photographer. I'm writing a scene for a stage play. In my scene, there's a celebrity in crisis in a park after sunset and a photographer who'd dearly like to get a ...
0
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6answers
135 views

Should I use EC when all details are captured?

I took this picture after looking at the histogram from my camera. Supposedly the details of the main object at the center was not clipped, but it is surely too dark to see it clearly. So i used ...
2
votes
2answers
211 views

How can I measure luminance values from different cameras?

Calculating EV and then Lx is pretty simple. The problem starts when trying to calculate these by using EXIF data that come from different cameras. I tried capturing a static object in the exact ...
6
votes
2answers
493 views

What is bracketing?

I have seen this term a lot and I was wondering what, in basic terms, what bracketing/autobracketing is. Also, why would one want to 'bracket'? P.S. - there are other questions asking what DoF and ...
1
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7answers
2k views

What could cause severe under-exposure when using a Canon 5D Mark III with Speedlite 600EX-RT with Evaluative E-TTL2 metering?

I recently purchased a Speedlite 600EX-RT for use with my 5D Mark III. I'm shooting with a 17-40 f4/L lens. Particularly when using the flash in the standard forward position, I get extremely severe ...
3
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7answers
531 views

Can ISO vary on different cameras?

We all know that [ISO] + [shutter speed] + [aperture] = a great picture. Now, let's take two different (very!) cameras: Nikon D3100 vs Nikon D800 and set them on Aperture priority. Settings for the ...
1
vote
4answers
332 views

Why doesn't my camera capture a dark picture when it looks dark to the human eye?

I tried searching for this, but found nothing on this topic: is there a way to set the camera to get images in around the brightness a human eye sees? For example, in bright daylight, I would set it ...
6
votes
2answers
136 views

How do objects in the dark come up when post processing?

I took one shot of oil lamps. Partial metering mode was used and I focused on the bright yellow light, as expected the image was captured with only the light and its immediate surroundings visible. ...
2
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2answers
611 views

How to picture thunder when storm is coming [duplicate]

Possible Duplicate: What technique and camera settings should I use to capture lightning strikes? My home town is very lack of thunders, but when time comes, I should be prepared to shoot. ...
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3answers
371 views

What's the difference between a closed and open aperture diaphragm for night street photos?

I'm capturing a picture during night and to a street with a lot of cars running over the street. What happens (in general, from a theoretical point of view) if I shoot the same photo under the ...
9
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1answer
274 views

Why doesn't noise depend on exposure time?

In the post Why do cameras use a single exposure rather than integrating across many very quick reads? an important question was if the noise depends on the exposure time or not. By noise I mean the ...
16
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7answers
611 views

Why do cameras use a single exposure rather than integrating across many very quick reads?

I have never understood why cameras need a shutter with a specific speed and why this cannot be adjusted in postprocessing. I think that present sensor works in an integral way: they save the amount ...
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2answers
580 views

When to use exposure lock with spot metering and when to use exposure compensation?

I was taking a snap on a sunny day, and the subject was in front of light source and subject was shadowed out(or blackened) In this case is it better to use partial/spot metering mode (zoom in to face ...
2
votes
2answers
547 views

Why does EV increase as ISO increases?

From what I understand, the lower the EV value, the more exposed (bright) the image is. EV decreases as aperture decreases. More light gets in with lower apertures. EV decreases as shutter speed ...
0
votes
3answers
227 views

Technical book about exposure

I am interested about studying exposure. I went through a few tutorial (as a beginner of DSLR photography) but I find them generally lacking of details. I have a background in engineering, physics ...
15
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4answers
719 views

Why do digital cameras need an exposure time at all?

From what I understand of digital cameras, they are basically a lens plus a tiny two-dimensional array of millions of photo-diodes. And from what I understand of photo-diodes, they create a voltage ...
6
votes
5answers
367 views

When determining exposure, is ISO typically taken into consideration secondary to aperture and shutter speed or is it equally as important?

In other words, do professional photographers typically pick the aperture and shutter speed they want and then after those are picked adjust the ISO until their exposure meter shows the shot as being ...
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votes
1answer
125 views

how to neutralise exposure in Manual mode [duplicate]

Possible Duplicate: How do I know I have the correct exposure when shooting in manual mode? I have a canon 550d, initially the settings were fine in Manual mode, but know I see following ...
10
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2answers
402 views

How can I expose a waterfall scene correctly?

Last day, I was photographing a waterfall. It was a bright day and I was shooting around 2-3 in the afternoon. I set aperture to f/11 and took the meter reading pointing camera towards the sky. ...
3
votes
4answers
1k views

D800 Previews Much Brighter in Camera, Very Dark When Rendered

I've been shooting with the D800 for about 6 months now, and I've noticed that the in-camera previews appear much brighter and more properly exposed. But when I load the RAW images into either ...
9
votes
3answers
257 views

How sharp of an image should I expect at night?

I'm a beginner with my first camera (sony nex6 mirrorless). I was trying my first few night shots Using the kit lens but I wasn't able to find a way to take sharp images. I've done the following: ...
11
votes
6answers
541 views

Are meteors dim?

I was out last night trying to shoot the Geminids meteor shower. I was using a Canon 5D2, 17-40mm f4.0 lens set to 17mm and f4.0, ISO 400. The camera was mounted on a non-tracking mount (only because ...
2
votes
1answer
107 views

Synchronization problems with Rekam NEO 200 and Canon 600D

I've recently got two Rekam NEO 200 lamps with synchronization cable. To connect them to my canon 600D i've bougth an adapter. The flash seems to sync correctly when setting exposition to values ...
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vote
1answer
444 views

Why would I use FEB (Flash Exposure Bracketing)?

In what situation would using FEB (Flash Exposure Bracketing) be a good idea? Exposure bracketing can be blended together with HDR, but why would I use FEB?
15
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5answers
2k views

If shooting RAW, is the white balance selected in camera irrelevant for exposure?

I have read the existing question - Does the camera white balance setting affect the raw image at all? After reading the above post, I am still not clear on the part around exposure. Is it possible ...
2
votes
2answers
174 views

What zone does lith film cutoff occur in?

With lith film, exposure accuracy is said to be of great concern - basically, it's a matter of black and white. But when metering, what zone does the cutoff between black and white happen in - is it ...
2
votes
2answers
784 views

How Avoid Vignetting using a variable ND filter

My camera is Nikon D700 Lens 28-300mm Lens 24-70mm I have a Variable ND filter 77mm size How do I avoid vignetting around the edges of the filter? thank you.
5
votes
2answers
486 views

Should my Nikon D3100 adjust settings to allow for use of flash in AP or SP mode

When I'm shooting with the onboard flash in low light conditions, I observe the exposure preview settings between no flash and the flash popped up - there appears to be little or no difference between ...
7
votes
5answers
999 views

How does software raise exposure in post-processing?

Does anyone know of any algorithms or can explain mathematically how brightness (EV) is executed in post-processing? Does it adjust the level of brightness/RBG/contrast for each pixel? Does it relate ...
8
votes
5answers
491 views

Heavy colour saturation on night photos with new lens? Is this normal

I have a Canon 550D and bought a Sigma 17-70mm lens to upgrade from the 18-55mm lens kit. I decided to go out and try the new lens with some night shots. To be honest, the results were bad. I used a ...
6
votes
4answers
620 views

Does the same aperture at a shorter focal length allow for faster shutter speeds?

I was about to ask why the new Canon 24-70mm F/2.8L II doesn't have IS, but then I came across the answer to Why there is no Canon 50mm *IS* lens? and it got me thinking... (The short version of the ...
4
votes
5answers
2k views

What's the difference between exposure and shutter speed?

Is there a difference between exposure and shutter speed, or are the terms interchangeable? I read that "If you use a quick shutter speed, you can just raise the exposure to compensate." Is this ...
6
votes
4answers
586 views

Photographing microfiche readers: Bright light forces camera to darken image

I am a researcher and often have to take photographs of material from microfiche cards. The problem that I have been encountering is that on non-digital readers, there is a bright lamp behind the ...
2
votes
3answers
1k views

What metering mode should one use with autoexposure (AE) lock on the Nikon D700?

I will be visiting Morocco in week's time. I usually use matrix metering when taking photographs. However I have read that using the autoexposure (AE) Lock on the Nikon D700 one should use center- ...
2
votes
2answers
359 views

Can the camera select wrong exposure just because of color?

I took two pictures of two different flowers with portrait setting. One came perfectly exposed with dark background, the other seems over exposed with brighter background. I tried it again and the ...
3
votes
2answers
249 views

Is the dynamic range affected by exposure time?

For a given scene, if I take 2 similar shots: short exposure time (maybe using higher aperture, higher ISO...) long exposure time (lower aperture or ISO) The goal is to have the shots with the ...