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The means by which a camera automatically determines exposure settings such as shutter speed, aperture, and ISO (sensitivity).

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2k views

How to relate LED Lumens to Lux at a given distance?

I'm trying to design an LED light, but I'm not sure how many LED's I need for a given light level. Specifically, the Luxeon LXR7-RW57 1000 lumen white LED (data sheet) Q: How many lux should I see ...
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0answers
41 views

Finding the actual size of an object in an image [duplicate]

This is more of a programming related question rather than with device related . Is there any command line utility that will help me to find the actual size of an object in an image . http://goo.gl/...
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5answers
1k views

What are the easiest (and best) solutions for avoiding a blown out background for a portrait?

Blown-out backgrounds seems like one of the more common issues amateur photographers deal with, and probably one of the things I struggle with most. Metering modes seem more of a compromise between ...
2
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2answers
947 views

How does 18% exposure algorithm work?

They all say and teach the rule that camera exposes to 18% grey. Then they go and show an example of shooting a white board or black board and they both show as a grey board in the camera. Great, but ...
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2answers
1k views

How do metering and aperture setting play together in manual mode (Minolta X-700)?

I have been playing around with my mother's Minolta X-700 (objective: Minolta MD 50 mm f/1.7) and though I read the manual (here it is: Manual X-700), I am still unclear about one thing: When I use ...
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2answers
886 views

Can a grey card be used in place of a flash meter?

I've been trying to improve my flash/studio skills. Googling around, I see that some tutorials use a flash meter to set ratios, two stops for white background... I'd rather not buy another piece of ...
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3answers
2k views

How do TTL flash metering systems calculate how much power is needed?

Does anyone know how TTL calculates the amount of power to put in after the preflash is done? I understand that the value is somewhat brand specific, but what is the general logic? Because if you ...
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5answers
427 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 ...
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1answer
338 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 ...
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4answers
572 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 ...
3
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2answers
2k 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 ...
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2answers
473 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. ...
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3answers
2k 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- ...
3
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2answers
439 views

How do i set studio flash power for a film camera without TTL/OTF metering

I have just bougnt an old fully manual medium format camera to play with, nothing serious. anyway on the lens there is a flash attachment point, which got me thinking: How do i decide on flash and ...
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2answers
355 views

Do point and shoot cameras have a metering sensor?

I have a Pentax point and shot camera and I tried to convert it to Infrared. I was successful to remove the front IR filter from CCD and then I had a 760 nm IR filter to kick start with the infrared ...
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1answer
343 views

What is the device held near the subject's face in this picture?

I have seen this device that is used widely in filmmaking. What is this device and what is it used for?
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4answers
1k views

Can different metering modes affect sharpness for a m42 prime lens?

Recently, I got some old m42 prime lens from Ebay and started playing with them with my Canon T3i/600d. However, it's difficult to get sharp pictures with these manual focus lens as there is no AF (...
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3answers
1k views

Metering mode for fireworks shooting

Following up from this question I would like to know what could be the correct metering mode that I should use to shoot fireworks? Since evaluative mode could be tricked here since the a large area of ...
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3answers
2k views

Metering strategies for time lapse

In short, my question is: what are the best metering strategies when shooting a time lapse sequence to avoid visible fluctuations in brightness? I'd like to make the day-to-night transition look ...
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5answers
1k views

Is it usual that a narrow aperture gives a darker picture in aperture priority mode?

I have a Nikon D60 camera here with a Nikkor 35 mm 1:1.8G lens. I don't have any experience with any other digital SLR, so excuse the beginner question. When using aperture priority mode, a narrower ...
8
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5answers
3k views

How can I work around metering issues with adapted lenses on a Canon DSLR?

I have a bunch of Contax lenses (C/Y mount) and a mount adapter with "dandelion" chips. This should allow me to use my lenses on any Canon DSLR using aperture mode and stopping down the lens. Thanks ...
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5answers
1k views

How to meter for manual bounce flash?

I use a Yungnuo flash in manual mode. I use it mostly indoors, so I bounce the flash off the ceiling. What is a good approach to read the camera metering and make adjustments to flash intensity? My ...
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2answers
244 views

How do dedicated light meters account for light transmittance?

Dedicated light meters seem to be well-regarded for their versatility and accuracy of metering. What puzzles me about them is how can they account for the different light transmittance of different ...
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2answers
257 views

What settings do I need for shooting a candid against the sky?

I have Canon 1000D. Most of the times I use canon 50MM F1.8. I use evaluative metering and single point (center) auto focus. What setting do I need to change to have metering of sky (say red of ...
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1answer
846 views

What is the reason for underexposure in my film photographs?

Thanks to all the quality answers I got here that helped me to buy a film camera. I got my first roll of film processed and printed. The print results are not as pleasing as looking at the slides ...
2
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3answers
811 views

What metering mode should be used for an HDR shot?

Maybe I'm over thinking this, but I think evaluative is the best being that it would give you the "best" balance of light across the scene. Is it dependent on the scene/mood at the time like a ...
4
votes
1answer
505 views

How do I keep the view finder light meter info on, on a Canon EOS1100D?

How do I keep the light meter display on in the view finder while using manual mode? I find that the display only stays on for a short while which is annoying when trying to set aperture and shutter ...
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3answers
5k views

What is the EV scale?

I have seen an "EV" (exposure value) scale that's sometimes used to express a camera's exposure settings, or scene brightness. How exactly does this scale work?
5
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2answers
469 views

Do I need a $600 light meter or will a $250 one do?

I want to learn more about light and I think finally getting a light meter will help do the trick. I'd like to see the amount of light coming from different light bulbs and the differences in the sun ...
2
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1answer
4k views

When to use different combinations of TTL/TTL-BL and Spot/Matrix metering?

I am trying to teach myself flash photography, and I am currently confused about metering modes. In what shooting conditions would each the following metering modes be best-suited? (And why do they ...
13
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8answers
721 views

Why can't digital camera sensors expose each photosite individually?

Why is it impossible for camera sensors to function the way the human eye can? What I mean is, why does a certain portion of the image have to be over/underexposed if we compensate for dark and light ...
3
votes
1answer
849 views

How important is lack of color matrix metering and 100% viewfinder in Nikon F100 compared to Nikon F5?

I'm planning to buy a film camera. I'm undecided between Nikon F100 and Nikon F5. The major differences that I could figure out from Thom Hogan's review are: Pro F100: F100 is lighter than the ...
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3answers
5k views

Why is exposure meter reading not changing in Manual mode?

I own a Nikon D90. I am new to exposure setting. In Manual mode, I could see the exposure meter changing towards right of zero and towards left of zero informing about under exposure and over ...
9
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0answers
340 views

How do I avoid a dark subject when there's bright sunlight from windows? [duplicate]

Possible Duplicate: How do you avoid a dim portrait with a bright background and no external flash? I recently shot some photos at a friend's wedding. The location was lovely with lots of ...
4
votes
5answers
7k views

How do I check the exposure meter reading on a DSLR?

I'm a beginner, and I have a Nikon D5100. Many times I come across the suggestion to "Check the meter reading for exposure." Where can I find this reading and how do I read it?
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5answers
23k views

How well do smart phone light meter apps work?

There are a number of smart phone apps which use the phone's camera as a light meter. How well do these work? The metering built into most modern cameras is very powerful and accurate, but in some ...
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2answers
3k views

What is a light meter, how do I use one, and for what sort of digital photography do I need one?

What is a light meter? How do I use one? What sort of photography will fool a digital camera's meter? Hence for those you do need to meter.
4
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2answers
518 views

How to calculate exposure time for Fuji Velvia RVP 50 using a DSLR spot meter?

I have a couple of RVP 50 rolls I would like to experiment with - The idea is to set up a tripod and use a Canon 5D MK2 in ISO 50 mode for composition focusing and exposure metering, then replace the ...
10
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1answer
641 views

Why isn't TTL metering accurate when using a non-electronic lens?

I recently bought a Lensbaby lens and I played with it a lot. Then lens is awesome but I have one big and annoying problem and is that TTL metering fails miserably when using P, TV and M modes. I ...
6
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4answers
1k views

How do I get a meter reading for a DSLR without a gray card?

I read an article called Expose (to the) Right, which explained why you should try to get the graph of the histogram as much to the right of the scale as possible. The reasoning is that DSLRs record ...
5
votes
1answer
526 views

What is the logic behind “Brother Backlit Sky” in the book Understanding Exposure?

I don't know if this question is too specific, but after reading Understanding Exposure, I can't understand very well the reasons and logic behind Brother Backlit Sky and their brothers. Although I ...
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6answers
1k views

What are typical situations where you should use auto-exposure lock (AE-L)?

What are the typical situations where you should use AE for locking exposure?
4
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2answers
500 views

How can I meter to get a black object black?

If I have something in my scene that I want rather close to pure black - can I spot meter off the object and then adjust the exposure by a consistent, pre-defined number of stops to get black instead ...
13
votes
4answers
4k views

How should I learn to understand Canon's metering?

Spot metering is my preferred metering mode on the Canon 50D. This allows me to nail the exposure first time -- 99% of the time -- by using AE-lock on my subject and applying the desired amount of ...
14
votes
5answers
1k views

What's a good ad-hoc replacement for a gray card?

I know that a real gray card is the best thing to use to determine exposure. But I'd like to know if there are other naturally available features that can be used in a quick and dirty way. Are fields ...
26
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3answers
4k views

How do I meter for long exposures (10+ minutes)?

One of my longstanding interests is long exposure night photography. However, many of the situations where I am shooting require exposure lengths on the order of 10 minutes, which is far beyond what ...
19
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4answers
16k views

How do I “focus and recompose” using spot metering?

I usually use the "[auto]focus and recompose" method for taking candid photographs. In situations where there is a high degree of contrast, I would like to use spot metering to correct expose for ...
3
votes
1answer
468 views

What is the photopic luminous efficiency function?

What is the photopic luminous efficiency function? Is it actually a the, or are there multiple such functions? Is it an absolute fact of nature or simply an agreed-on standard? If the later, who says?...
16
votes
2answers
11k views

What is the difference between luminance and illuminance?

The more I read about this, the more confused I become. Illuminance, as I understand it, measured in lux, is the perceived brightness of light on a surface. It's what you'd measure with an incident ...
8
votes
3answers
405 views

Does spot/partial metering always assume 18%?

I'm beginning to work on understanding and hopefully effectively using different metering modes in my photography. I have done some reading and understand the benefit of using spot and partial ...