Linked Questions

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1answer
1k views

Using a camera as Lux-meter

For a project I want to use a USB-camera (https://www.e-consystems.com/ar0330-lowlight-usb-cameraboard.asp) as a Lux-meter. I control the camera using v4l2 on Linux. I have a real lux-meter (https://...
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2answers
404 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 ...
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4answers
117 views

Shooting film with a camera that doesn't have a ISO meter

So got a yashica J that doesn't have an iso dial or meter and I was wondering does that mean my camera is only limited to a set of film iso or that I can't push or pull the film
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1answer
386 views

What is the -5 to +5 scale below the aperture number on the back of my Canon DSLR?

Hello guys, I am completely new on this photography world and honestly I don't have much knowledge about it, but I really want to learn... and read. I've been reading about modes, light, shutter ...
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3answers
261 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 ...
1
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1answer
251 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 ...
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2answers
169 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)...
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4answers
107 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 ...

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