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.

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84 views

Real light increments using aperture scale in fractional stops

In the case of using f-number with full stops, the +1EV step means 2*light because the Area (A = πr^2) in the diaphragm is doubled (i.e. radius*√2). However, I don't know why in fractional stops such ...
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How do I determine the light output of LED lights for close-up photographs of indoor plants?

is there a method to determine the light output of LED lights needed to achieve a reasonable ISO/shutter/aperture combination to take close-up (not necessarily macro) photos of indoor plants given a ...
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4answers
966 views

What is the role of Shutter Speed while using a Manual Flash?

The relation that allows us to set the aperture or to choose the distance to take a photo with correct brightness while using a manual flash is this one: Guide number = f-number × distance, For a ...
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1answer
67 views

Collodion / Wet Plate: How to guess the exposure time?

How can I guesstimate the exposure time for a collodion wet plate? Any helpful hints? I have a lightmeter, a Sekonic 308, so I can take measurements. I know that the age of the collodion plays into ...
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1answer
29 views

Correct Exposure with Polaroid One Step 2

I have a Polaroid OneStep 2 with itype film, and I have some problems on how find the correct exposure. Precisely, almost always I get a picture which is overexposed or underexposed, and I do not know ...
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1answer
112 views

Why did my Canon 80D recommend such a fast shutter speed in near-total darkness?

This morning I went out to shoot the sunrise. I went out well before dawn, and it's one day from the new moon, so it was very dark while I was setting up. I turned the ISO up to the maximum setting ...
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3answers
195 views

Why are all my photos still under-exposed when the settings are correct?

I'm inside a lit room with the shutter speed at 1/125s, aperture is f/5.6 and ISO is 400, but every photo I take is still really underexposed. Even if I have the shutter speed on 1/60s and I hold the ...
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88 views

Film photography with flash - distorted exposures

I've just started my adventure with film photography. I recently took some photos to get a grip of my Pentax MX camera with AF280T flash. Unfortunately more than half of photos done with flash came ...
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2answers
174 views

How does a camera determine aperture when in shutter-priority mode?

Recently I experimented with using shutter-priority ("Tv" on my Canon DSLR) for images shot from my kayak, because movement is a constant factor in that situation (even if there's no wind, there's ...
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6answers
926 views

Is spot metering just an EV compensation?

I can expose a scene based on EV compensation or spot metering. If I spot meter...can I achieve identical results with EV compensation? Or is spot metering more than just a generic EV adjustment ...
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92 views

How do I prevent washed out photos with an Olympus Mju II on sunny days?

Whenever I use my Olympus Mju II with ISO 200 film on a warm very sunny day, the photos come out washed out. I need help with what proper film to use.
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Gray values on QP card 201

I have a colour standard card QP 201 which I am hoping to use to calibrate gray values in some scientific photos. For this purpose I will need to know the percentage gray values of the gray squares (e....
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Why TTL flash exposure compensation doesn't work, but manual settings do on Nikon D3500? [closed]

If I choose TTL in flash control and I set flash exposure compensation, all levels from -3 to +1 look the same. But if I chose manual instead, and I adjust flash power from full to 1/32, the strength ...
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0answers
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What are the ISO, exposure, and aperture settings for single frames from slow-motion video on the iPhone 6?

I filmed a video of myself swinging a tennis racket in slow motion and then used cv2 to make jpg's of some of the frames, ie. 8 frames from the start of the swing to follow-through evenly spaced, and ...
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2answers
121 views

How to handle frequent, uncontrolled lighting changes?

I was taking photos of birds in a sanctuary. There I experienced few challenges. I want to know how to handle these. There were frequent daylight variations as it was partly cloudy. It was a bright ...
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1answer
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Canon 6D and 580exll

I am new to flash photography, what is the best shutter to use for general portraits in and out doors. What shutter speed should I not go above.
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342 views

Why is this photograph shot with Delta 400 and developed with D76 1+1 so grainy

I have the following image: I used Ilford Delta 400, shot with FM2 at box speed. Metered inside the camera. It was developed with D76 1+1, Adofix, Adostop, Ilfotol wetting agent. I follow Mass.Dev....
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5answers
167 views

How can I capture images of discs (CDs, DVDs) that emphasize scratches and defects?

I’ve been trying to figure out a setup that would allow me to take pictures of the backs of video game discs that would show any scuffs or scratches the discs have. I’ve tried a lot of variations but ...
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1answer
102 views

Inconsistent exposures using my Neewer Vision 5 strobe with Nikon d7100

I was doing a photoshoot of children and was getting great shots using my nikon d7100 with a Neewer vision 5 ttl strobe flash. Then all the sudden I could not get proper exposure! Every once in a ...
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1answer
43 views

Why does an increase in Y' channel contrast result in apparent desaturation?

And is this the same phenomenon we see when colours appear less saturated during the middle of the day versus dawn and dusk (when luma contrast is reduced)?
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1answer
293 views

The Sunny f/16 Rule [duplicate]

Sunny-16: for optimum exposure when shooting on a clear, sunny day outdoors (distinct shadows), set the aperture to f/16 and the shutter speed as the reciprocal of the ISO. While reading about the ...
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2answers
232 views

Why are most of my photos way too dark/underexposed?

I've been taking pictures for years now, firstly with some old digital Nikons, then Canons, then I moved to mirrorless Fuji XT3 (I love it!). Unfortunately most of my pictures have been way too dark, ...
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6answers
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Does a lens with a bigger max. aperture focus faster than a lens with a smaller max. aperture?

The assertion by a well known photographer is that the Nikon 400mm f/2.8 set to an aperture of f/5.6 will let in 4 times the light compared to a Nikon 500mm f/5.6 lens set to f/5.6, keeping the ...
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3answers
130 views

Were these Robert Frank photographs made by underexposing in camera versus in development?

These are example images which I think is purposely underexposed: Robert Frank, The Americans Plate 43. Robert Frank, Mary and Pablo in Bed, c.1954 My question is that are those images underexposed ...
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0answers
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Calculating EV of an image file using its exif data

I'm trying to calculate the EV (exposure value) for an image file based on its exif data. In Wikidepia, I came across this formula for calculating EV: EV = EV100 + LOG(S/100, 2) = LOG(N^2 / t, 2) +...
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2k views

Canon 70D often overexposing or underexposing shots

It really started to bother me, I don't know what it is, is it difficult lighting conditions for the camera is it my settings, but I very often get incorrectly exposed pictures with my 70D. Here are ...
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4answers
2k views

What to do when you've set the wrong ISO for your film?

I’ve put my Fujifilm Superia X-TRA 400 into my Minolta Hi-Matic 7 and I forgot to change the ISO setting for the new film. It’s set for the last roll at 200. So what setting should I put for a normal ...
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6answers
1k views

How to choose the correct exposure for flower photography?

I have an old Minolta X-700 with an MC-Rokkor lens (its internal light metering was broken) and I'd like to use it to take photos of flowers. I use Sunny 16 rule, and though it seems that for the ...
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4answers
158 views

Should I use +1 EV compensation when shooting with Ektar 100 on a cloudy day?

I'm using Ektar 100 for the first time and the weather report is not looking good. I think my day trip will be cloudy and will try to use an old Pentax Zoom 280p with Ektar. I will take city/ street ...
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3answers
100 views

Overcast / city exposure

I find that the sky brothers exposure method is lacking 2 big levels... I'm back from 2 weeks in Europe and i metered mostly off the sky and most of my shots are underexposed... Where should we meter ...
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1answer
57 views

Manual and Shutter Priority Mode Problem [duplicate]

I am using Nikon D5300 with AF-P NIKKOR 18-55mm kit lens. When i try to take shot from manual and shutter priority model, the camera produce half shutte release sound and the image gets all while and ...
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4answers
1k 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, ...
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2answers
126 views

How to 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 ...
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1answer
97 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 ...
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2answers
159 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 ...
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2answers
417 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 ...
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1answer
89 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 ...
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3answers
137 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 ...
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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 ...
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5answers
458 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 ...
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6answers
238 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. ...
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4answers
893 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 ...
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1answer
128 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 ...
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2answers
92 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. ...
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1answer
78 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 ...
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1answer
165 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 ...
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3answers
81 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 ...
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2answers
59 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? ...
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3answers
170 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 ...
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3answers
189 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)