Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [exposure]

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 exposure.

10
votes
4answers
737 views

Why is a lens darker than other ones when applying the same settings?

I own a Nikon D500 DSLR, with a Nikkor 16-80 mm 1:2,8-4E ED VR lens. I noticed that this lens, when applying exactly the same settings (same ISO, same aperture, for instance F8.0, same Shutter speed, ...
2
votes
3answers
89 views

How can I best take pictures of a moving speaker in a dark room with accent lights?

I’m taking pictures this Sunday at my church of the youth pastor preaching and in the youth room is a semi-lit type of room with a lot of accent colour lights. He’s going to be moving and I want to ...
0
votes
1answer
37 views

How to set exposure for photographing the milky way?

I want to photograph the milky way but have had troubles with ambient light. The first attempt suffered from streetlights. The second attempt away from streetlights suffered from full moon which I ...
2
votes
2answers
122 views

Is this posterization? How to avoid it when stretching histogram?

Last weekend I took some photos in the mountains, where I can't control the light, nor the movement of the subjects. Some of the photos had very little contrast and brightness, and were a bit ...
1
vote
0answers
36 views

Why is 120fps preset underexposed compared to 24fps preset with similar settings? [closed]

Sony a6500 here. I am trying to dial in my 1 and 2 presets. I would like the 1st to shoot 4K at 24 fps and the 2nd one to shoot HD at 120 fps, but otherwise generally be similar in terms of depth of ...
2
votes
2answers
314 views

Which ISO should I use for the cleanest image? [duplicate]

Assume the case of a Canon 6D Mark II. Its lowest ISO is regulary 100. If expanded, I can set it to L, which is ISO 50. Until now, I was always under the impression the lower the ISO the cleaner the ...
0
votes
1answer
72 views

How does a DSLR measure brightness and sharpness of an image?

In mirrorless cameras, light reaches the image sensor all the time, so this data can be used by the camera to determine the correct focus, shutter time, aperture and ISO. Makes sense so far. However ...
0
votes
3answers
121 views

Why isn't glass transparency part of the exposure calculation? [duplicate]

The F number is a ratio calculated purely from the focal length of the lens and the size of the aperture. Any light meter talks in terms of F, Shutter, and ISO. Different glass, or just different ...
18
votes
5answers
4k views

Do f-stop and exposure time perfectly cancel?

I am photographing a scene with white and black elements in it. Starting at the f/22 stop, I widen the aperture one stop and decrease the exposure time by a factor of 2, take a picture, and keep doing ...
3
votes
5answers
401 views

Why does color hue change on different exposures?

When shooting with long exposures (multiple to tens of seconds) I noticed that in some cases colors in the resulting photos change hue. This was on Canon EOS 1100D, but I've also seen such a problem ...
2
votes
6answers
83 views

Do I need 1/128 flash power at guide number 43-44 or is 1/32 enough?

I am planning to take photographs that have a shallow depth of field (50mm f/1.8 on a crop sensor body) and that are also lighted by an external off-camera flash. I am comparing two external flashes. ...
6
votes
4answers
818 views

Why did this image turn out darker?

In this tutorial on creating christmas themed images the author describes how she adjusted her exposure settings to add more weight to the christmas lights She says she went from f/2.8 and 1/3 of a ...
0
votes
1answer
77 views

How can I manually set EV in Lightroom to take a neutral density filter into account when merging photos?

I shoot a couple of Images and try to merge them with Lightroom. Since a few (but not all) of the shoots were taken with an ND-Filter. I need to somehow tweak the EV value of the Photos I took with ...
4
votes
2answers
74 views

Does the T-number account for lens vignetting, or only for glass/coating transmission?

Surprsingly I could not find information on this. Many lenses have vignetting profiles available. Vignetting changes if you use a cropped sensor, or, in case of zoom lenses, can change with zoom. ...
1
vote
1answer
64 views

HDRI with ND Filter

When I take images for composing a HDR image later how can I use an ND-Filter. For example I capture 5 images whitout an Filter and then add for the 6 and 7 shot a 10 Stop ND-Filter how can I tell the ...
1
vote
1answer
128 views

Why is same image exposed at 100 ISO noisier than 3200 ISO? [duplicate]

I used to believe that ISO adds noise as a drawback to increasing exposure, but after researching the topic I arrived at the conclusion that it is a misconception. By amplifying the existing signal ...
0
votes
3answers
80 views

Shooting on Manual and still getting variation in exposure

Basically i shoot clothing on a hanger on a white background. I have everything set up custom that never changes, a light and a camera that also never move. Yet when i change the clothing item i'm ...
0
votes
2answers
56 views

How do constant aperture zooms produce identical exposure, even though focal length is larger? [duplicate]

My understanding is that a larger focal length corresponds to a larger working aperture diameter, since the numerator is larger. Why doesn't a larger working diameter correspond to a brighter image? ...
-1
votes
3answers
94 views

Mathematical definition of EV on a RAW photo? [duplicate]

I'm trying to write a program that takes in a matrix full of 12-bit RAW sensor values (that range from [512-4096]) (512 is the BAYER sensor black level--> i.e. what pure black is defined as) and ...
3
votes
3answers
101 views

How do I figure out what ISO to use when shooting film?

I'm new into film and I recently bought a pack of 200 film. I'm just not sure what ISO to use. I don't want my photos to come out over or under exposed. (I have a Minolta X-700)
4
votes
4answers
823 views

What is the relationship between film speed and the ISO setting on my film camera?

What is the relationship between the speed number of the film you put into your film camera and the ISO adjustable setting on the camera itself? Do you put them on the same number or do you adjust ...
1
vote
1answer
109 views

How to calculate difference in exposure between two given frames?

This question regards exposure. I have a project I am working on where I need to be able to calculate the exact number of stops between two given exposures, with the end goal being to match the ...
0
votes
1answer
89 views

Overexposed and not clear photos Olympus stylus 1

I am having some issues when taking photos with my Olympus Stylus 1. When setting things in auto photos are overexposed and a bit blurry. I have taken the same photo with a GoPro5 all in auto and the ...
0
votes
4answers
258 views

What is the relationship between lens diameter and exposure?

All of the online calculators for exposure, I have seen, factor in time, film speed, and aperture (which is a function of the iris diameter and the focal length of the lens). However I would have ...
-1
votes
3answers
109 views

If I use my digital camera (w/min. ISO of 200) as a light meter, how do I set exposure for ISO 100 film?

I have a Fuji X-T100 and its lowest ISO setting is 200. Now, I’d like to shoot some slides like Provia 100 or Ektachrome 100 as well as Portra 160, using my Fuji as a light meter (it works pretty well ...
0
votes
4answers
274 views

How can I get a high shutter speed and correct exposure when taking photos of horses in an indoor arena?

So I do a lot of inside photos. The problem that I'm having is a need a fast shutter speed without a flash. Like horses inside an arena. I can't have a flash but I need to take still photos. But the ...
3
votes
4answers
159 views

how can I have equivalent exposure and identical white balance while changing f stops using speedlight?

how can I have equivalent exposure and identical white balance while changing f stops using speedlight? im shooting from shoes when it comes to the moment of changing f stops from 5 to 16 in order to ...
4
votes
1answer
180 views

Why does push processing seem to be so popular?

It seems that many people are very eager to push their film. If you check sites such as Flickr or other communities discussing film photography, it can feel like almost as many people are shooting at ...
5
votes
9answers
900 views

Should I continue to learn exposure on a film camera or switch to digital?

I have a Canon AE-1 but I’m new to photography. I mean it’s always interesting me but I never did anything until now when I found this camera in my grandma's attic. It works pretty well. I mean I ...
2
votes
2answers
149 views

When would lack of auto-exposure bracketing (AEB) be a deal-breaker for an entry-level DSLR? [closed]

I am a beginner to DSLR, and I am currently shooting with Nikon Coolpix. As an upgrade I am looking to buy D3400. I checked its specs and seems like AEB is missing. Is it really needed for a beginner ...
1
vote
3answers
244 views

How to take a dark photo of a dark room?

I was trying take a photo of a room at dusk. No artificial lights and the room was quite dark - it was difficult to read but not pitch dark. I adjusted the parameters so that the exposure meter in the ...
3
votes
2answers
144 views

How can I bump up shadows in post without overexposing the image?

I'm trying to create a Photoshop/Lightroom RAW processing preset to process 1200 images for photogrammetry. It's important that the lighting on them is as flat as possible and the shadows get bumped ...
12
votes
3answers
2k views

What are physical causes of clipping?

What exactly limits modern digital camera sensors in capturing light intensity beyond certain point?
2
votes
0answers
43 views

Canon DSLR photos underexposed [duplicate]

I have a canon DSLR and even in Manual mode or with proper settings, I have to bump aperture, shutter speeed AND ISO to get photos to be even CLOSE to the right exposure. Currently have my ISO set to ...
11
votes
10answers
5k views

Either background is overexposed or the foreground is underexposed. Are there possible solutions/approaches?

I use an Olympus EM-10 with a Panasonic Lumix MFT lens. No other accessories apart from the build in flash. I trained a situation in a restaurant to take a picture of the table inside with an outdoor ...
5
votes
3answers
2k views

Are burned out highlights bad?

I have read many answers and articles saying that I should avoid blown out highlights, but is it really a bad thing? Why should I avoid it?
1
vote
1answer
98 views

How to use Pentax A3000 in dim lighting?

My Pentax A3000 doesn't have shutter speed control, only ISO and a few modes, B (bulb), 60 for flash, program, and aperture. I keep it on program, but what should I do if I want to shoot in darker ...
12
votes
3answers
1k views

Why do my photographs taken with a film camera look so saturated?

I’m starting to shoot photographs using my Dad's old camera, an Olympus OM-4. I’ve noticed that in comparison with my friend's photographs mine are a lot more saturated. Why can it be? Here's an ...
3
votes
1answer
278 views

What is causing dark pictures in Auto Exposure mode?

I have been using my Nikon D40x in Automatic mode, and it went from taking beautiful pictures to suddenly taking very dark pictures. I have done a "reset", thinking that I must have hit a button that ...
2
votes
2answers
171 views

How to get bright concert photos?

I've been starting to shoot some live music recently and have been doing an okay job and see an improvement with each time I shoot. However recently I was shooting and all of my photos have come out ...
16
votes
8answers
3k views

Does using long exposure together with ND filter make the scene look more evenly lit? [duplicate]

Suppose I try to shoot a piece of forest with trees casting dense shadows during daylight. It looks something like this to a human eye (part of larger and more detailed image from here) In the image ...
2
votes
1answer
96 views

Night portrait with noiseless in focus background [duplicate]

We know to take a noiseless night landscape/cityscape, we need use a tripod and set a low ISO. For example in a scene I use ISO 100, aperture f/8.0 and exposure time 30 seconds, I get a night ...
3
votes
2answers
122 views

Requirements for long-exposure night time webcam

I am working on a computer vision project that requires repeated measurements of the amount of light a specific building emits at night. I want to set up a webcam and a Rasperry Pi, and set it to take ...
0
votes
1answer
53 views

Why would a webcam image be brighter in the corners, rather than in the middle?

I have a webcam mounted inside an integrating sphere, which is dimly lit by LED and produces nothing but sensor noise. It's part of a daft random number generator I built. This arrangement is like:- ...
22
votes
5answers
6k views

Why doesn't the picture become darker the more you zoom in?

As your lens's focal length gets longer, fewer photons pass through the lens to hit the mirror/sensor. Why don't you see darkening when you look into the viewfinder and zoom in with a zoom lens, and ...
5
votes
6answers
717 views

Can I maintain the same flash pulse duration but increase light with multiple flash units?

I own a Yongnuo YN-560 III speedlite, and I found out that it lets me freeze motion (for example, a water splash) at 1/16 of its power. However, the amount of light at 1/16 is not enough to properly ...
11
votes
6answers
4k views

Why are flash pulses so short?

I was surprised to learn that most flashes last only 1/1000s instead of lighting up for the entire exposure time. Why? If the flash were to light up before the shutter opens and turn off after the ...
0
votes
1answer
375 views

why exposing with 18% gray card does not give IRE near 40?

I am trying to understand how to get perfect exposure using gray card. With my Sony a6500 using ITU709 gamma, I locked exposure by doing spot metering on the gray card. When importing in final cut pro ...
3
votes
4answers
796 views

Why are my photographs on Kodak Portra 400 coming out hazy and gray? Am I getting the exposure wrong?

I'm pretty new to film photography and photography in general. I've been taking my cameras (Canon A-1 or Pentax ME super, portra 400 film) with me to most places and trying to gain as much experience ...
4
votes
4answers
897 views

With the same camera settings, will a photo always be exposed correctly across different cameras?

I want to do a photo shoot using film, but due to not being able to see the shots I've taken I would first like to take a digital photo, then recreate it using film. If I used the same focal length, ...