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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What mathematical operation does the raw exposure slider in photoshop do? And how does it differ from adjust exposure when the file has been opened?

If I open a raw file in Photoshop without modifying the raw exposure and compare it to the same file with a raw exposure modification of -0.2; when I inspect the linear values it seems like a ...
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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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Lumix GH5 — Blue Grains in Preview Screen

I have been trying to find an answer to this all over the place. I haven't been successful so far, hence, coming here in hopes that someone has experienced a similar issue. I'm an owner of a GX8 and ...
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0answers
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Analogue camera: exposure counter is broken?

I bought an analogue camera (Pentax MZ-50) and every time I turn on/ off the camera the exposure counter goes one up, meaning the frames are being unused as I am not taking any photos. How is it ...
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0answers
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White photos on Canon S5 IS

I have an old CANON S5 IS camera, which I was using for half a year until it started to take completely white photos. Exposure and white balance are set to normal. ISO is also set to auto. In low-...
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0answers
82 views

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 ...
1
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1answer
254 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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0answers
32 views

Automatically Match Exposure for non-RAW files

Hello i'd like to automatically match exposure of PNG, where there's no extra data except for the pixels, how can I automatically match their exposure? Thanks
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0answers
34 views

How to Read RawDigger Histogram with EV

I newly have just started to use RawDigger for inspecting raw image quality. However, still I am not too familiar with all its properties/concepts, and I am specifically confused with how to read ...
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1answer
217 views

Why does my adapted f/2.8 lens make very dark images in manual and action mode?

I'm using a Sony A7 II with adapter with a Canon EF 24-70mm f/2.8L and a Canon 16-35mm f/2.8L both with the same settings, but the exposure on the 24-70mm is darker in the manual and action modes, but ...
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2answers
152 views

What are these dark spots on my picture

I took the picture in a hospital room. The spots are not the patients bed. I tried cleaning my lenses. I also took other pictures and this is the only one that has the spots.